The report highlights that external drives are also extremely handy for transporting data between locations and devices in what used to be known as sneaker-net. External USB/Thunderbolt SSDs and/or hard drives (aka direct-attached storage, or DAS) are a super-convenient way to add storage capacity to your system as well as back it up.
In a fresh development, revolutionize your workflows with system update-changing convenience and ease. High-capacity with bus-powered single-cable USB-C connectivity, Seagate One Touch desktop external hard drive delivers a fuss-free, clutter-free backup experience that lets you work anywhere, anytime. Get in touch with total storage freedom.
As part of the ongoing story, depending on your intent, we’ve got picks for you. Your particular needs will determine whether your choice for external storage should prioritize speed, in which case you’ll want an SSD with a fast interface (USB4 or Thunderbolt); capacity, which will always favor more affordable hard drives; or portability — you can’t get more portable than a pocketable thumb drive.
In a fresh development, many of the prices quoted below and in the referred reviews will soon be, or are already out of date. Due to the current worldwide shortage of NAND (Thanks, AI!), SSD prices have skyrocketed.
According to the latest update, if your fresh external SSD doesn’t perform up to snuff, talk to the vendor about a firmware patch, or use a Thunderbolt cable of suitable speed, which is how we solved the issue for testing. Thunderbolt cables are generally of far higher quality than some commodity USB cables. As of February 21, 2026 we’ve experienced at least two drives that performed well below expectations when used with their bundled cables.
According to the latest update, pCWorld’s reviewers have been testing PC devices for decades. Our storage evaluations are thorough and rigorous, pushing the limits of every product — from performance benchmarks to the practicalities of daily use. As PC users ourselves, we know what makes a product stand out. Only the best external drives make this list. Why you should trust PCWorld for external drive reviews and buying advice: It’s in our name!
The report highlights that but these are not normal times, so our advice is to check current prices before buying. In normal times, this is the recommended option for anyone looking for an affordable that’s still “fast enough” — or anyone who is currently saddled with a USB 3.2 port that’s limited to 10Gbps speed.
The report highlights that that’s about $17 more than it cost when I reviewed the drive, making it a still-reasonable price in this time of extreme NAND-price inflation. But if you want to step up to 2TB, Amazon is asking a jaw-dropping and $290. That’s more than the 2TB version of our favorite 20Gbps drive below. For instance, you can find this fantastic little magnetic square of a drive for 1TB / $117 on Amazon as of this writing.
In a fresh development, and unlike the latter, you can stick it to a metal object like a PC case via the circular magnet on the back. Note that aluminum is not particularly magnetic, so this doesn’t work with most Macs. Price disparities aside, the EX300U is the fastest 10Gbps SSD I’ve tested to date, besting the Teamgroup X2 Max listed below by a small margin.
In a fresh development, at least Corsair provides a TBW rating — most vendors don’t for external SSDs. The warranty on the EX300U is three years, which is the usual for external SSDs, but the 250TBW (terabytes that can be written) per terabyte of capacity is a little stingy.
As part of the ongoing story, most of the time platform releases are reading data, not writing it. Still, the odds of anyone exceeding that TBW limit is rather low.
According to the latest update, read our full.
The report highlights that corsair EX300U review.
The report highlights that it’s small even for a thumb drive, and just as fast as almost any 10Gbps SSD — small or large — that we’ve tested. Anyone seeking top-performance in the classic fits-easily-in-a-shirt-pocket thumb drive form-factor should be looking to the Teamgroup X2 Max.
As part of the ongoing story, externally, it conveniently provides both captive Type-C and Type-A connectors so you don’t have to drag around cables or adapters. The X2 Max uses NVMe storage internally which accounts for the performance.
The report highlights that put bluntly — there’s no better option if fast thumb drive storage is what you seek. It’s relatively pricey compared to a commodity thumb drive, but the performance is well worth it.
According to the latest update, read our full.
As part of the ongoing story, teamgroup X2 Max review.
As part of the ongoing story, if your laptop supports USB 3.2×2 for 20Gbps performance and you want to take full advantage of it, and/or you’re not the most careful person with devices, this ruggedized external SSD is a practical way to ward off accidental damage.
In a fresh development, it’s handsome and lightweight to boot, as well as an admirable performer, even besting one of the fastest 20Gbps drives I’ve tested — the Crucial X10 Pro — in a couple of our tests. The PNY RP60 offers more than just a rugged IP65-rated exterior that protects against dust and water droplets.
According to the latest update, the only issue is that the USB 3.2×2 drives function at only 10Gbps or slower unless attached to a dedicated 20Gbps port. That applies to most USB4 and Thunderbolt ports as well. A 20Gbps SSD is the sweet spot in the price/performance ratio for external SSDs.
The report highlights that note that these prices are significantly higher than when I first reviewed the RP60 due to the worldwide NAND shortage. The RP60 is competitively priced at $180 and $230 for 1TB and 2TB, respectively.
According to the latest update, read our full.
As part of the ongoing story, pNY RP60 20Gbps USB SSD review.
Industry observers note that it’s priced more like a 10Gbps SSD than a 40Gbps model, and while it’s the slowest USB4 drive we’ve tested, that’s like saying it’s the slowest F1 car on the grid — it’s still plenty fast. Those looking for USB4 performance without breaking the bank should be shopping Addlink’s P30.
Industry observers note that add in a small form-factor and good looks and you have yourself a winner. Additionally, the P30 is super handy for anyone looking to add semi-permanent external storage to a PC with a metal case — there’s a magnetic ring that allows you to “stick” the drive in place.
According to the latest update, that makes it a workable drive even for pros. It’s also one of the few drives that is likely a better bargain than rolling your own with an external enclosure such as TerraMaster’s D1 SSD Plus. Using modern TLC, the P30’s write rate only drops to around 800Mbps when it runs out of secondary cache.
According to the latest update, read our full.
In a fresh development, addlink P30 USB4 SSD review.
The report highlights that note that to run a 40Gbps USB4 external SSD, your PC needs to support the USB4 or the Thunderbolt 3/4/5 spec. And while cheaper than 80Gbps, it’s still not cheap. If you want top-notch sustained throughput, but for less money than an 80Gbps SSD, the 40Gbps SE920 will get the job done and then some.
According to the latest update, if you want a lot of capacity, the Adata SE920 is available with up to 4TB, but it’s currently in short supply and has become very expensive. If you meet those criteria, the Adata SE920 will deliver you nearly 4GBps transfers, and at a slightly more affordable price than our previous pick for USB4, the OWC Express 1M2 — for example, $280 for a 1TB Adata SE920 versus $300 for the 1TB OWC drive.
Industry observers note that a nifty built-in fan is activated by sliding open the enclosure. In my tests, the fan helped keep my drive noticeably free of heat during benchmark tests. In almost every benchmark, the SE920 beat the OWC Express 1M2, even if by small margins.
According to the latest update, measuring around 4.1 inches long by 2.5-inches wide by 0.6-inches thick, and weighing 7 ounces, the SE920 is quite portable, giving it another advantage over the bulkier OWC Express 1M2 and others.
According to the latest update, read our full.
As part of the ongoing story, adata SE920 USB4 SSD review.
The report highlights that anyone who needs lots of room for data plus the speed of an SSD should be shopping for the SanDisk Desk Drive, which is available with up to 8TB of capacity.
The report highlights that partly because it’s a bit too bulky for a pocket or laptop bag, but primarily because it requires an AC adapter. It’s hardly a behemoth; it’s just not as convenient as a pure bus-powered unit for transport. As the name suggests, the SanDisk Desk Drive isn’t nearly as portable as the other drives in this list.
According to the latest update, that’s also evident in the fact that it ships only in 4GB and 8GB capacities. The Desk Drive is aimed at users with more sedentary work scenarios, to function as auxiliary storage and a fast backup medium.
According to the latest update, but that surcharge buys you brisk 10Gbps performance, and the assurance that comes from an SSD’s lack of moving parts, i.e. Susceptibility to wear and shock damage. In other words, its speed, ruggedness, and reliability make it worth more than an HDD. Granted, the Desk Drive costs a lot more per-gigabyte than you’d pay for a backup hard drive.
According to the latest update, read our full.
The report highlights that sanDisk Desk Drive 10Gbps USB SSD review.
Industry observers note that those looking for capacity without the high price should be looking at 2.5-inch external hard drives, and this capacious drive in particular.
As part of the ongoing story, it won’t. In the end this drive has the best combination of price, capacity, and performance in its class. We can forgive the cumbersome name, and the fact that this drive, misleadingly, doesn’t actually capability a Type-C port (but rather an adapter), because there is a misconception among some that Type-C will make a portable hard drive faster.
According to the latest update, this makes the WD My Passport a natural fit for backup, particularly during off hours when an SSD’s superior speed won’t really save you any time. For starters, the WD My Passport, Works with USB-C offers a ton of capacity — up to 6TB — and at a far more affordable price per terabyte than one can get from an SSD (a little less than $30/TB versus $60 to $80 for the latter).
The report highlights that yup, the port is the much older Micro-B. Mind you, WD’s My Passport Ultra drives, which actually do capability a USB-C port, don’t perform any faster than this drive, and cost a bit more. As for the misleading moniker, the My Passport does indeed work with USB-C, but it’s by way of the drive’s bundled Micro-B to Type-A cable and Type-A to USB-C adapter.
As part of the ongoing story, if it’s a portable, high-capacity hard drive that you’re after — pick this one. In fact, the My Passport performs on par with the best of 2.5-inch hard drives we’ve tested, while being the best deal.
According to the latest update, read our full.
According to the latest update, wD My Passport, Works with USB C review.
According to the latest update, it’s available with up to 28TB of capacity — more than three times the current maximum for SSDs. Users looking for the most capacity for the least amount of cash, should definitely be checking out the 3.5-inch Seagate Expansion Desktop.
In a fresh development, nice. The Desktop Expansion also delivers twice the sustained transfer rate of the average 2.5-inch external hard drives — our 16TB test unit read and wrote at close to 280MBps.
The report highlights that as mentioned, all this storage comes at a very competitive price point, hovering around $30 per terabyte, compared to the $70 per terabyte an external SSD costs.
According to the latest update, alternatively, you can run them in mirrored (RAID 1) pairs, though that cuts into the bargain price per terabyte by quite a bit. The relevant caveat with all HDDs is that they are more likely to fail than SSDs, and important data on them should be backed up regularly.
Industry observers note that as we said in our review of the drive: “If you deal with large amounts of data, you can’t beat a high-capacity hard drive for gathering it into one place.” This is the drive we’d pick for that job.
According to the latest update, read our full.
As part of the ongoing story, seagate Expansion Desktop review.
The report highlights that the CPU is a Core Ultra i5 225 feeding/fed by two Kingston Fury 32GB DDR5 4,800MHz modules (64GB of memory total). Both 20Gbps USB and Thunderbolt 5 are integrated and Intel CPU/GPU graphics are used. SSDs involved in the test are mounted in either a HighPoint 7604A 16x 4-slot PCIe 5.0 RAID adapter card or a single-slot Asus ROG M.2 PCIe 5.0 adapter. Drive tests currently utilize Windows 11 24H2, 64-bit running off of a PCIe 4.0 Samsung 990 Pro in an Asus Z890-Creator WiFi (PCIe 4.0/5.0) motherboard.
Industry observers note that a two-drive 25GBps RAID 0 array on the HighPoint 7604A 16x PCIe 5.0 adapter card is used as the secondary source/destination. We run the CrystalDiskMark 8, AS SSD 2, and ATTO 4 synthetic benchmarks to find the storage device’s potential performance, then a series of 48GB and 450GB transfers tests using Windows Explorer drag-and-drop to show what you’ll see under Window, as well as the far faster FastCopy to show what’s possible.
Industry observers note that note that in normal use, as a drive fills up, performance may decrease due to less NAND for secondary caching, as well as other factors. This can be less of a factor with the current crop of SSDs with far faster late-generation NAND. Each test is performed on an NTFS-formatted and newly TRIM’d drive so the results are optimal.
The report highlights that sSD performance can and will vary by capacity due to more or fewer chips to shotgun reads/writes across and the amount of NAND available for secondary caching. Vendors also occasionally swap components. If you ever notice a large discrepancy between the performance you experience and that which we report, by all means, let us know. Caveat: The performance numbers shown apply only to the drive we were shipped and to the capacity tested.
In a fresh development, note also that some of the SSDs in this roundup were tested using other equipment and methodologies which you can read about in the standalone reviews.
Industry observers note that to learn more about our testing methodology see PCWorld’s article on how we test external SSDs.
According to the latest update, he’s been using and testing HDDs, SATA SSDs, and NVMe SSDs for PCWorld for well over two decades. To paraphrase a well-known commercial, you might say he’s seen a thing or two. Jon L Jacobi has witnessed storage morph from punch cards and tape to solid state.
Industry observers note that yes, USB 4 will provide the same massive throughput as Thunderbolt 3/4.
Industry observers note that there are four general categories when it comes to external storage, all fairly self-explanatory: portable SSD, portable HDD, desktop HDD (typically larger capacity, larger footprint, and requiring external power, and thus meant to be stationary), and thumb-drive SSD — the smallest and most portable external storage, but often limited in capacity.
Industry observers note that you’ll want an SSD, which can be 10 to 20 times faster — depending on the interface — than a hard drive. SSDs also offer sub-millisecond seek times where HDDs seek at tens of milliseconds. If you’re looking to treat your external storage as an extension of your internal storage, then performance is likely paramount.
The report highlights that currently, single SSDs top out at 8TB, 2.5-inch HDDs at 6TB, and desktop 3.5-inch HDDs at 36TB. On the other hand, if the primary role is backup, then you might want to opt for a hard drive (HDD) with its larger capacity and a significantly lower price per gigabyte/terabyte.
According to the latest update, see our guides to the best SSDs and best PCIe 4.0 SSDs. Need internal storage instead?
The report highlights that however, the most recent, greatest (highest capacity) drives of both types tend to carry a premium, simply because the publisher knows some users want as much capacity as they can get and are willing to pay more. The cost per TB of both SSDs and HDDs tends to drop as capacity increases.
In a fresh development, but do the math before you plunk down your hard earned money — you may find deals. Below you can see the phenomenon in terms of a WD 2.5-inch HDD. Normally, you’ll get the lowest price per terabyte from the second-highest capacity drive, aka last years model.
According to the latest update, the worst value for an external hard drive is typically the lowest-capacity drive.
In a fresh development, above you can see the general more capacity, cheaper per terabyte pattern.
Industry observers note that video sucks up space at a remarkable pace, especially at higher resolutions. With SSDs, traditionally we’ve recommended twice the capacity you think you’ll need as older types tended to slow down as they filled. Modern SSD controller design has mitigated this to a great degree, but it’s still our rule of thumb. If you’re extending your internal storage, you probably know better than we do how much you’ll need.
As part of the ongoing story, again, twice the amount of total data on the drives to back up is a good start. Remember, you’ll want at least one full system backup, then regular incremental, differential, or data-only backups. If you’re going for backup, then the more the merrier.
Industry observers note that in that case twice the amount of essential data you have will do the trick. Sensing a 2X pattern here? That said, reinstalling Windows and your applications isn’t quite the insane drudgery it once was, and you can likely get away with just backing up your data.
In a fresh development, another rule of thumb: 1TB for travel and light backups, 2TB for mainstream photo/video libraries, 4TB+ for larger archives, 8TB+ for desk-bound bulk backup.
According to the latest update, the more the merrier, and the further back in time you can keep backups for. Note that these are our minimum recommendations.
In a fresh development, in fact, you’re unlikely to run across an external HDD that offers a faster interface unless it’s a multi-bay RAID box. Even then, 10Gbps is likely to be more than fast enough. If you’re buying an HDD, the interface is relatively unimportant — even older 5Gbps USB offers more than enough bandwidth to accommodate the 300MBps that is as fast as a modern HDD can deliver data.
Industry observers note that the internals of most external SSDs these days are NVMe rather than SATA, and capable of 3GBps. No matter what the internals, 5Gbps USB (3.0) limits the drive to just over 500MBps, 10Gbps USB (3.2) to just over 1GBps, and 20Gbps USB (3.2×2)/Thunderbolt 2 to around 2GBps, so you’re leaving performance on the table with any of those. For SSDs, there’s a huge difference in performance depending on the interface involved.
The report highlights that however, if you’re rocking a newer computer you may have Thunderbolt 3/4/5 or if it’s really recent, USB4. Those will deliver around 3.5GBps unless they’re the still rare 80Gbps flavors in which case you’ll see around 6.5GBps. Of course, those may be all that your computer offers, so buy to match.
According to the latest update, windows Explorer is a horrible performer in data transfers. We recommend using FastCopy or if you’re a command line type — Xcopy. Both of which are two to three times as fast as Explorer transferring large files. Note that all those numbers are what you’ll see with synthetic benchmarks.
In a fresh development, you’d be hard pressed to find a computer or device that won’t support them and they function on nearly every USB and Thunderbolt port in existence. Compatibility is a major concern and where 5Gbps and 10Gbps USB reign supreme.
Industry observers note that they drop to 10Gbps on 10Gbps USB ports and most Thunderbolt ports. USB 3.2×2 on the other hand requires a dedicated 20Gbps port or a newer USB4 port to function at the full 20Gbps speed.
The report highlights that but on USB4 ports, even that’s not guaranteed. We haven’t seen one yet, but full 40Gbps implementation in true USB Forum fashion, isn’t required, so there might be slower 20Gbps USB4 SSDs and ports. Obviously, 40Gbps USB4 requires a USB4 port or Thunderbolt 4/5 port to reach maximum speed.
Industry observers note that in truth, USB4 is basically Thunderbolt 4 with some minor tweaks. 80Gbps Thunderbolt SSDs require a Thunderbolt 5 port, and/or the upcoming 80Gbps USB4 second gen. Thunderbolt SSDs generally require a Thunderbolt 3/4/5 port or USB4 port to function at 40Gbps.
As part of the ongoing story, that said, 80Gbps Thunderbolt 5 is pretty sexy. USB4 SSDs are easily the most compatible (backwards to USB 2.x, forward to Thunderbolt 5) high-performance types, so they’re currently our recommended interface for speedy data delivery.
As part of the ongoing story, from top to bottom in the image below: Mini-USB, Micro B SuperSpeed, SuperSpeed Micro B, Thunderbolt 2/mini DisplayPort, and Type-C. You’ll also find the occasional Lightning connector drive (not shown). More complete descriptions follow below. Though the industry is generally on board with Type-C connectors at this point, you may still find some older types around.
Industry observers note that while we of course recommend orientation-agnostic Type-C, you can find Type-C adapters or adapter cables for any type.
Industry observers note that the second drive functions the connector that replaced it: Micro B SuperSpeed. The Orange drive functions both a SuperSpeed Micro B and Thunderbolt 2 (mini DisplayPort connector). The bottom drive functions USB-C or USB Type C. The top drive uses the older, slower Mini-USB interface.
As part of the ongoing story, it’s small, easy to insert, and you don’t have to worry about which side faces up as with Type-A. USB Type-C, USB-C, Type-C is the most recent USB connector and the one the global stage is standardizing on.
According to the latest update, what is carried over the wires varies greatly: USB 2.0 High Speed (480Mbps) to USB 3.2 SuperSpeed 20Gbps, as well as USB4 and Thunderbolt 3/4/5 and any combination of them. Keep in mind that Type-C refers only to the connector itself.
The report highlights that uSB Type-A: You won’t find this familiar rectangular port on any drive, but you will still find it on plenty of PCs and laptops as well as the male version on the other end of most Type-B and Type-C adapter cables.
According to the latest update, it’s actually the same Micro USB port used on older phones, but with more data lines to hit USB 3.0 speeds. It’ll do 5Gbps and is fine for hard drives and SATA (internally) SSDs. Micro-B cables are generally Type-A on the PC end. USB 3 Micro-B is the wider, flatter port that’s still very common on many lower-cost portable and desktop external hard drives.
In a fresh development, type B ports are becoming rare, though you might find one on older 5.25-inch enclosures, printers, and scanners. It supports speeds up to 5Gbps and cables are generally Type-A on the PC side. USB 3 Type-B is the larger, squarer version of USB 3.0 Micro B.
Industry observers note that it’s found on older Macs, but even Apple put it out to pasture in 2017. There’s no need to invest in a Thunderbolt 2 drive unless it’s for legacy support issues. That said… Thunderbolt 2 is dead at this point.
In a fresh development, the adapter does not, however, carry power, so bus-powered external drives (no power jack) will require a powered dock. …Apple sells a bi-directional Thunderbolt 1/2 to 3 adapter if you need to connect the one generation to the other.
In a fresh development, created for attaching external storage to your computer’s SATA bus, eSATA was a cheap way in its day to move beyond the toddling 60MBps performance of USB 2.0. ESATA is another legacy port that’s disappeared from newer devices.
According to the latest update, as with Thunderbolt 2, the only reason to invest in an eSATA drive is for use with older computers. 5Gbps USB 3.0 put the last nail in eSATA’s coffin.
In a fresh development, once upon a time, I used to regularly send copies of my recordings to my mom’s for safe-keeping. We discussed the rule of three for backup, but while the cloud is a great offsite option, you can also manage that with multiple external drives — storing them in different locations.
Industry observers note that you might even consider a dual-drive enclosure and run them mirrored, i.e. The same set of data written simultaneously to both. SSDs aren’t nearly as prone to mishap as hard drives, but even then… If you’re using your external storage as a primary repository for important data, then you should have a second drive as a copy.
Industry observers note that for more guidance on building out the best backup plan possible, see our roundups of the best cloud backup services and best Windows backup programs.
The report highlights that if speed is important, the best 40Gbps external drive is the Adata SE920 at 40Gbps; for 20Gbps performance, and a significant cost savings, consider the PNY RP60; for the best balance of performance and price, we recommend the 10Gbps Corsair EX300U. Consumers have a lot of excellent external SSDs to choose from.
Industry observers note that it’s super slim, but capacious, cheetah fast, and has both Type-C and Type-A connectors. Currently, the Teamgroup X2 Max is the pick of the litter.
According to the latest update, if you’re looking for capacity, then it’s Seagate’s Expansion Desktop. If you’re looking for portability, get WD’s My Passport, Works with USB-C (note that it uses an adapter for USB-C, not a native USB-C port).
According to the latest update, hDDs (hard disk drives) are essentially boxes containing spinning platters with read/write arms that skim across them to detect the orientation of, or re-align particles in the magnetic material that coats the platters.
According to the latest update, data is instead stored in cells — aka, voltage traps — which are interconnected in a matrix. The matrix approach allows for data to be pushed or pulled to/from many different places at once and significantly increases both read and write speed — on the order of 100 times faster currently. SSDs (solid state drives), on the other hand, use flash memory and have no moving parts inside the drive.
The report highlights that the main drawback to SSDs is that you pay quite a bit more per terabyte of storage. As technology and production techniques improve, the price of SSDs has and will continue to drop. Generally speaking, SSDs are a better bet for your external drives due to their smaller size, faster speeds, and far superior durability.
As part of the ongoing story, at roughly the rate that it changes. This is especially true if you are working on an important project or have data that you absolutely cannot afford to lose. The key point here is that if your drive goes belly up, everything added since your last backup is toast. As often as possible, i.e.
Industry observers note that otherwise, connect and back up at least once a day. See our roundups of the best Windows backup programs and the best online backup services to learn more. If you have your external drive connected to your computer at all times, it is a good idea to automate the backup process and have the drive back up your data as it changes, or every hour or so.
As part of the ongoing story, we know of no major service that’s lost data, but there’s always a first time. Even if you work with your data in the cloud, a local backup is a very good idea.
The report highlights that your 2TB drive indeed has two trillion bytes of storage, and if you look at the byte count that Windows displays in a drive’s properties dialog, this should be what you see. This, in the International System of Units (SI/decimal), is two terabytes, or 2TB. This is the standard language vendors use as consumers are far more familiar with base 10. This is because of the difference between the binary and decimal number systems, their nomenclatures, and a Microsoft miscue.
In a fresh development, binary multiples are larger numbers (one KiB is 1,024) so when Windows divides the total bytes by the IEC system, the you get something like 1.8TiB for a 2TB drive. Alas, Windows labels this as 1.8TB, misleading the user. However, Windows uses the newer International Electrotechnical Commission (IEC) binary multiples 2^10 (Kibibyte/KiB), 2^20 (Mebibyte/MiB), 2^30 (Gibibyte/Gib).
In a fresh development, the file system uses some storage for file location and size info, etc. Also, some drives come with a small partition containing programs so the main partition will be smaller than the drive’s total capacity. Other reasons you might not see as much available storage in the properties tab are formatting or partitioning.
According to the latest update, they’re mechanical devices subject to wear and susceptible to shock damage, so they should be kept cool and treated gently. Reliability has increased dramatically over the last decade. The lifespan of an external hard drive can be anywhere from three minutes to 10 years or more depending on make and model, as well as the amount of use and operating environment.
According to the latest update, of course check the warranty, but the MTBF (Mean Time Before Failure) number is generally considered fantasy within the industry. Peruse user feedback which can provide insight into long term usage, and keep your ears peeled for strange noises, your fingers crossed, and don’t drop the thing! Our best guess is that you should get at least five years with careful handling. Alas, judging the likely lifespan of an external hard drive is a crap shoot.
In a fresh development, sSDs generally have a TBW (terabytes that may be written) rating, but this is rarely provided by vendors for external SSDs. Hint: They may not use the same SSD inside throughout the product lifespan. SSDs don’t wear out or break mechanically, but their cells can only be written to so many times.
Industry observers note that that’s a lot of data, and a lot of SSDs are rated well below what they might achieve. You can guesstimate by using a utility to see how much data you write to an SSD a day and then doing the math. Most internal M.2 NVMe TLC SSDs are rated for around 600TBW per terabyte, and QLC types for around 200TBW, though the type of NAND in use is also rarely provided by vendors.
According to the latest update, as is the TBW. Our best guess based on experience is perhaps a decade. However, certain models have had issues long before that — generally due to a flaw or failure in the bridge chip or controller. External SSD warranties are generally between three and five years, but as with all such things, it’s a financial risk calculation for the publisher.
In a fresh development, the motor might quit, the read/write heads might crash into the platter surface due to shock while operating, or the electronics might overheat and go belly up. You might get a warning in the form of strange noises such as a scraping or grinding sound. If the data is particularly important, turn it off immediately and call a recovery service. That scraping sound may be the coating on the platter being removed by a crashed head. This is unrecoverable. If you keep running it, back it up immediately and replace it. There are a few of ways that an external hard drive might fail.
As part of the ongoing story, sSDs will also eventually wear out, though this only precludes further writing to the unit. You can still read what’s on the drive, so it’s not the disaster a HDD failure can be. SSDs generally go belly up due to the increasingly rare controller failure, which is a relatively easy fix/reset for someone who knows the SSD’s internals such as a recovery service.
In a fresh development, in order, the fastest PC external interfaces are currently: 80Gbps Thunderbolt 5, 40Gbps USB4/Thunderbolt 3 and 4, 20Gbps USB 3.2×2, 10GBps USB 3.2, then 5Gbps USB 3.x.
As part of the ongoing story, in order of compatibility: USB4, Thunderbolt 3/4/5, USB 3.x, USB 3.2×2, USB 3.x, USB 2, and USB 1.1.