SSK
SSK Portable SSD 4TB External Solid State Drives
Bottom line: The SSK Portable SSD 4TB External Solid State Drives ($469.99 on Amazon as of 2026-10-21 12:20 UTC): 1050MB/s read and 1000MB/s write over USB 3.2 Gen2 10Gbps; main trade-off: 4TB reads as 3725GB in Windows, which surprises some buyers.
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*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.
Pros & Cons
Pros
- ✓ 1050MB/s read and 1000MB/s write over USB 3.2 Gen2 10Gbps
- ✓ USB-C and USB-A cables both included, no adapter needed
- ✓ Works with iPhone 15/16/17 Pro, Android, Mac, and Windows
- ✓ SLC cache holds full speed on transfers under 250GB
- ✓ S.M.A.R.T. health monitoring plus TRIM to sustain write speed
Cons
- ✗ 4TB reads as 3725GB in Windows, which surprises some buyers
- ✗ SLC cache eats 25% of available capacity for speed headroom
- ✗ Transfers over 250GB can fall off the 10Gbps pace
- ✗ 10Gbps caps below the 20Gbps of USB 3.2 Gen2x2 drives
Manufacturer description
The SSK Portable SSD 4TB is a pocket-sized external solid state drive built for people who move large files between phones, laptops, and tablets without waiting. It runs on USB 3.2 Gen2 at 10Gbps, delivering read speeds up to 1050MB/s and write speeds up to 1000MB/s, so a folder of 4K footage or a Steam library backup lands in minutes rather than an afternoon. SSK ships both a USB-C and a USB-A cable in the box, which means the same drive plugs into an iPhone 15/16/17 Pro, an Android phone, a Mac, or an older Windows tower without hunting for an adapter. SLC caching keeps transfers under…
SpecPicks Verdict
SpecPicks scored SSK Portable SSD 4TB External Solid State Drives using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. SSK's external storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for external storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Why does my 4TB SSK drive show only 3725GB on Windows?
Windows counts 1GB as 1,024MB while the drive is rated using 1,000MB per GB. The same drive displays as 4TB on macOS. No capacity is missing.
How fast is the SSK Portable SSD 4TB?
It reads up to 1050MB/s and writes up to 1000MB/s over a USB 3.2 Gen2 10Gbps connection, with an LED light indicating active transfers.
Will this work with my iPhone 15, 16, or 17 Pro?
Yes. SSK lists iPhone 15/16/17 Pro compatibility, and the included USB-C cable connects directly. It also supports Android phones, tablets, Windows, and Mac.
Do I need to buy a separate USB-A cable for my older PC?
No. Both a USB-C and a USB-A cable are included, so the drive bridges newer phones and older desktops out of the box.
Does the drive slow down during big file transfers?
Transfers under 250GB hold a steady 10Gbps thanks to SLC caching, which reserves 25% of available capacity. Larger single transfers may exceed that cache.
Key Features
- Capacity Reminder: 4tb external hard drive may display as 3725GB on Windows but 4TB on macOS due to measurement differences. The capacity reduction from hard drive actual capacity stems from algorithmic differences, where 1GB is calculated as 1,024MB on Windows versus 1,000MB on SSDs
- 1050 MB/s Speed: Instantly access to your files with blazing-fast 10Gbps external SSD read up to 1050MB/s and write up to 1000MB/s. LED Light indicates USB SSD instant activity
- Data Security: Master solid state drives health with S.M.A.R.T. monitoring. TRIM technology ensures consistent write speeds and extends the lifespan of the portable SSD
- USB-C & USB-A Cable: Both USB-C and USB-A cables featuring rapid USB 3.2 Gen2, this USB SSD effortlessly bridges devices, enabling seamless cross-platform file transfers between computers, smartphones, tablets and Phones
- Always Fast: No slowdowns during large file transfers. When transferring files smaller than 250GB, this external ssd remains steady 10Gbps with SLC caching (25%of the current available capacity is allocated for high speed cache)
Full Specifications
| Brand | SSK |
|---|---|
| Color | Grey |
| Model Name | SD500/4TB |
| Read Speed | 1050 Megabytes Per Second |
| Form Factor | Portable |
| Media Speed | 1000 Megabytes Per Second |
| Connectivity | USB-C |
| Model Number | SD500 |
| Compatibility | Android, iOS, Mac |
| Built-In Media | 4TB External SSD Drive, USB-A TO USB-C Cable (10Gbps), USB-C TO USB-C Cable (10Gbps) |
| Hard Disk Size | 4 TB |
| Hard-Drive Size | 4 TB |
| Mfr Part Number | SD500 |
| Number of Items | 1 |
| Special Feature | 1050 MB/s, LED Light, Portable, SMR Technology, TRIM Support |
| Hardware Platform | Linux, Mac, PC |
| Installation Type | External Hard Drive |
| Compatible Devices | Desktop, Laptop, Smartphone, Tablet, Television |
| Data Transfer Rate | 1050 Megabytes Per Second |
| Enclosure Material | Aluminum |
| Full listing title | SSK Portable SSD 4TB External Solid State Drives, up to 1050MB/s USB C SSD External Hard Drive USB 3.2 Gen2 for iPhone 15/16/17Pro, Windows, Mac, Android Phones and Tablets |
Ready to buy?
SSK Portable SSD 4TB External Solid State Drives, up to 1050MB/s USB C SSD External Hard Drive USB 3.2 Gen2 for iPhone 15/16/17Pro, Windows, Mac, Android Phones and Tablets is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.
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