Silicon Power Bolt B75 Pro Portable SSD Review: Affordable, but Not Pro

Good looks and a nice price impress. But we’re not sure Silicon Power’s latest external lives up to its name.

(Image: © Tom's Hardware)

Tom's Hardware Verdict

If you’re looking for a cheap external SSD that will keep up with you on the go, the Silicon Power Bolt B75 Pro does the trick. But it does have some quirks.


  • +

    Sleek aesthetics

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    Good media file transfer performance

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    256-bit encryption support

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    Competitively priced


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    Not as rugged as marketed

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    Slow direct to TLC write speed

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Capable of SATA-like speeds and available in capacities of up to 2TB, Silicon Power’s Bolt B75 Pro Portable SSD is both speedy and spacious. It even features encryption software for enhanced data security when you’re on the go. It’s also priced quite competitively, although it isn’t without its quirks.

Silicon Power’s Bolt B75 Pro is marketed as quite a durable device. The company says it’s military-grade shockproof, with a design that was inspired by a WWI-era German Junkers F.13 transport plane. And with military design in mind, it is quite secure with 256-bit encryption software for added security.


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ProductBolt B75 Pro 256GBBolt B75 Pro 512GBBolt B75 Pro 1TBBolt B75 Pro 2TB
Capacity (User / Raw)256GB / 256GB512GB / 512GB1024GB /1024GB2048GB /2048GB
Interface / ProtocolUSB-C / USB 3.1 Gen 2USB-C / USB 3.1 Gen 2USB-C / USB 3.1 Gen 2USB-C / USB 3.1 Gen 2
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-AUSB Type-C to Type-C & USB Type-C to USB Type-A
Sequential Read520 MB/s520 MB/s520 MB/s520 MB/s
Sequential Write420 MB/s420 MB/s420 MB/s420 MB/s
Interface ControllerASMedia ASM234cmASMedia ASM234cmASMedia ASM234cmASMedia ASM234cm
NAND ControllerSM2258XTSM2258XTSM2258XTSM2258XT
Storage MediaIntel 64L TLC NAND FlashIntel 64L TLC NAND FlashIntel 64L TLC NAND FlashIntel 64L TLC NAND Flash
Default File SystemexFATexFATexFATexFAT
Security 256-bit AES encryption 256-bit AES encryption 256-bit AES encryption 256-bit AES encryption
Dimensions (L x W x H)124.4 x 82.0 x 12.2mm124.4 x 82.0 x 12.2mm124.4 x 82.0 x 12.2mm124.4 x 82.0 x 12.2mm

The Bolt B75 Pro is available in capacities of 256GB, 512GB, 1TB, and 2TB. It utilizes a USB 3.2 Gen 2 type-C interface to deliver speeds of up to 520/420 MBps read/write. 

The drive features a standard three-year warranty, but lacks an official endurance rating at the time of writing. It is both Mac and PC compatible, as the Bolt B75 pro comes formatted as exFAT out of the box. Note, though, that our testing was completed with the drive formatted as NTFS.

Software and Accessories

The Bolt B75 Pro comes with two one-foot long USB cables, one type-C to type-C and the other type-C to type-A. Both power the device off the USB bus.

Silicon Power’s SP Widget software is compatible with this drive and available for download. With it, you can configure backups, enable the AES 256-bit encryption, and more.

Closer Look

The Bolt B75 Pro measures 124.4 x 82.0 x 12.2 mm and weighs in at 105 grams. The sleek aluminum casing features a multi-side power indicator light.

The drive is easily disassembled via four Philips head screws. But while the housing is sleek it’s a bit less durable than we expected. The exterior features a lightweight aluminum-alloy finish, which we were able to bend rather easy. This is unlike much tougher LaCie externals drives we’ve tested in the past. 

Opened up, we find inside houses a SATA-to-USB PCB featuring an ASMedia ASM234cm bridge chip and a SATA SSD that is secured using double-sided adhesive foam. Once we dig a bit deeper, we see that the Bolt B75 Pro is powered by a Silicon Motion SM2258XT SATA controller and Intel 64L TLC NAND flash. Being a Silicon Motion XT controller, that means this SSD does not feature any DRAM, which helps to help keep down cost, but can also negatively impact performance.  


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Sean Webster
Storage Reviewer

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