Lexar SL100 Pro Portable SSD Review: Pro Pricing, Semi Performance

Tom's Hardware Verdict

Lexar’s SL100 Pro packs NVMe goodness into a sleek and stylish portable package. With speeds of up to 950/900 MBps read/write, it's capable of 4K media editing and most other tasks. But write speeds can degrade to 180 MBps during large transfers. Considering its price is about double the SATA-based competition, most users are better off seeking alternatives.


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    Sleek aesthetics

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    Impressivemedia file transfer/editing performance


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    Short cables

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    DataVault not available in the US at the time of writing

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    Slow direct-to-TLC write speed

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NVMe over USB, but at what cost?

Lexar, which was bought by Chinese SSD maker Longsys back in 2017 after previous owner Micron announced it was getting out of the retail removable storage business, is offering up a new SL100 Pro portable SSD and with impressive performance ratings. With speeds of up to 950/900 MBps read/write, this USB-C 3.1 Gen 2 device is speedier than the typical run-of-the mill SATA based external SSD. Its small size and shape make it very pocketable for those who are constantly on the go, and it features beautiful aesthetics. But pricing needs to be brought back down to earthly levels before it gets our recommendation.

Lexar has been in the flash memory business for over 20 years, though recent times have been rocky, the brand seems to be back on track.Two years later its acquisition, the company has launched the world’s first 1TB SD card and a new series of NVMe and SATA based SSDs. Alongside these launches also comes an external drive aimed at the creative professional, the SL100 Pro, which we are taking a close look at today in the 1TB capacity.

The SL100 Pro is the faster variant of their SL100 external SSD. It uses the latest USB-C 3.1 Gen 2 interface to deliver high-performance for the working professional, double what the SL100 or any SATA SSD can do. It features a darker look than the SL100’s grey finish and features a higher capacity option than the non-pro model, which tops out at 500GB.


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ProductSL100 Pro 250GBSL100 Pro 500GBSL100 Pro 1TB
Capacity (User / Raw)250GB / 256GB500GB / 512GB1000GB /1024GB
Interface / ProtocolUSB-C / USB 3.1 Gen 2USB-C / USB 3.1 Gen 3USB-C / USB 3.1 Gen 4
Included Cable (s)USB Type-C to Type-C & USB Type-C to USB Type-AUSB Type-C to Type-C & USB Type-C to USB Type-AUSB Type-C to Type-C & USB Type-C to USB Type-A
Sequential Read950 MB/s950 MB/s950 MB/s
Sequential Write900 MB/s900 MB/s900 MB/s
Interface ControllerJMicron JMS583JMicron JMS584JMicron JMS585
NAND ControllerMarvell 88NV1160Marvell 88NV1161Marvell 88NV1162
Storage Media64L Micron TLC NAND Flash64L Micron TLC NAND Flash64L Micron TLC NAND Flash
Default File SystemexFATexFATexFAT
Security256-bit AES encryption256-bit AES encryption256-bit AES encryption
Dimensions (L x W x H)55 x 73.4 x 10.8 mm / 2.165” x 2.89” x 0.425”56 x 73.4 x 10.8 mm / 2.165” x 2.89” x 0.425”57 x 73.4 x 10.8 mm / 2.165” x 2.89” x 0.425”
Weight0.155lbs. / 70.5g (Without Cable)0.155lbs. / 70.5g (Without Cable)0.155lbs. / 70.5g (Without Cable)
Part NumberLSL100P-250RBNALSL100P-500RBNALSL100P-1TRBNA

Lexar originally launched the SL100 Pro in three capacities: 250GB, 500GB, and 1TB. But, since have dropped the 250GB model, although some can still be found from some online retailers. Th drive features a three-year warranty and is compatible with both Mac and PC. Out of the box, it comes pre-formatted as exFAT, although our testing was completed while formatted as NTFS.

With current prices being about double what most other external SSDs go for, pricing is a big issue for the SL100 Pro product line. Speeds of up to 950/900 MB/s read and write are faster than SATA based competitors, but not fast enough to warrant double the cost. A simple USB 3.1 Gen 2 NVMe enclosure like a the Pluggable USBC-NVMe or MyDigitalSSD M2X plus a standard NVMe SSD would come in cheaper and offer just about the same level of performance, as we noted in our recent feature: How to Build Your Own External SSD.

Software and Accessories

Included in the package are the portable SSD itself and two short USB cables. One is USB-C to USB-C while the other is USB-C to USB-A cable. The latter is much appreciated for broad compatibility, since many PCs don't yet have USB-C ports, or might just have one, while USB-A is much more common.

Lexar’s SL100 Pro SSD also works with ENC’s DataVault Lite software for added security. When enabled, it utilizes 256-bit AES encryption to encrypt data on the device to keep it safe from prying eyes. As another bonus, this helps to ensure your deleted data stays deleted as well. Files that are deleted from the vault are also securely erased and can’t be recovered. There is just one issue here, however. At the time of writing, due to US government requirements, the download for the software was temporarily unavailable until further notice, and it doesn’t come pre-loaded on the device. So if security and encryption are high on your priorities list, you should probably look elsewhere--at least until the software becomes available again.

Closer Look

The drive measures 55 x 73.4 x 10.8 mm and weighs in at just over 69 grams. Lexar’s SL100 Pro features a blacked-out brushed aluminum exterior that is as stylish as it is durable. It feels solid in the hand and has a bit of heft to it. As an SSD, it should be able to withstand significant drops and shock and still keep going, unlike the spinning platters and delicate read/write heads of hard drives.

As we said before, this isn’t your typical run-of-the-mill SATA-based external SSD. It’s not quite as fast as some of the Thunderbolt 3 devices available, but with a custom-designed PCB and the fastest USB interface currently available, it's quite fast. And powering it is an interesting combination of components.

Inside of this classy exterior is a JMicron JMS583 USB to NVMe bridge chip that connects to a Marvell 88NV1160 NVMe SSD controller that is, in turn, managing a bunch of 64L Micron TLC NAND flash. This controller is a lower-end model but obviously has enough grunt to saturate the interface, even without DRAM.


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Sean Webster
Storage Reviewer

Sean is a Contributing Editor at Tom’s Hardware US, covering storage hardware.