# Western Digital SN5000 4TB Review — QLC Capacity Play With Gen4 Pace (2026)

The Western Digital SN5000 4TB trades the line's TLC for QLC, gains the family's fastest 5,500 MB/s rating and hits 4 TB at a mainstream price positioning.

Quick answer: Buy the Western Digital SN5000 4TB as a bulk-storage Gen4 drive: 4 TB of single-sided M.2 with 5,500 MB/s reads, 900K random-write IOPS and five years of coverage is a strong package for game libraries, media volumes and PS5-style expansion where read speed dominates. Skip it for sustained heavy writing — the QLC NAND concedes post-cache throughput that TLC capacities keep, and a DRAM-equipped alternative holds up better there. The Crucial P3 Plus 4 TB is the like-for-like QLC rival, Samsung's 990 EVO Plus the speed-first option, and the SN5000 2 TB the pick if 2 TB is genuinely enough capacity. For a QLC capacity play executed this carefully, the SN5000 4TB earns its place in the WD Blue range.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 4 TB |
| Interface | M.2 4.0 x 4 |
| Controller | WD in-house |
| Memory type | BiCS 6 3D QLC |
| DRAM cache | No |
| Sequential read | 5500 MB/s |
| Sequential write | 5000 MB/s |
| Random read IOPS | 690000 |
| Random write IOPS | 900000 |
| Endurance | 1200 TBW |
| MTBF |  |
| Warranty | 5 years |

## Performance

WD rates the 4TB SN5000 at 5,500 MB/s sequential reads, 5,000 MB/s writes, 690K random-read and 900K random-write IOPS — the strongest ratings in the family, and 5,500 MB/s happens to match Sony's recommended read speed for PS5 expansion. Tom's Hardware's 4TB review called that read speed optimal for console-class use and delivered a positive verdict on the mature platform; TweakTown highlighted the capacity-per-watt angle. For reads the drive behaves like any healthy Gen4 drive: 5,500 MB/s loads games, levels and DirectStorage assets with headroom to spare.

Writes are where the QLC shows. The nCache 4.0 pseudo-SLC cache absorbs installs and everyday copies at rated speed, but sustained transfers that outlast the cache drop to a fraction of the 5,000 MB/s figure — independent reviewers consistently measured post-cache throughput in the few-hundred-MB/s band, with ServeTheHome's early 4 TB testing lining up with reader-reported figures around the 500-600 MB/s mark. For a game library that pattern is irrelevant — installs are cache-friendly bursts — but for constant video ingest or scratch duty, a TLC or DRAM-equipped drive is the better tool. Random performance is strong for a DRAM-less design, and thermals stayed manageable in reviews, though a heatsink remains worth adding.

## Endurance, TBW & Warranty

WD backs the SN5000 4TB with a 5-year limited warranty rated to 1,200 TBW of writes, whichever arrives first. That is the largest endurance budget in the family in absolute terms — the 2 TB is rated at 900 TBW and the 1 TB at 600 — but the QLC NAND means the per-terabyte ratio actually drops at this capacity, and WD's own scaling confirms the 4 TB is not simply the 1 TB multiplied. At 20 GB of writes per day, 1,200 TBW stretches past 160 years, so the warranty term is the practical limit. Support runs through WD's standard channels with WD Dashboard handling firmware and health reporting. The SSD Review characterised the endurance as adequate for the drive's bulk-storage mission.

## Pros and Cons

**Pros:**

- 5,500 MB/s reads, the fastest in the SN5000 family
- 900K random-write IOPS rating
- 1,200 TBW endurance with 5-year warranty
- Single-sided M.2 2280 fits PS5 and thin laptops
- Read rating matches Sony's 5,500 MB/s PS5 recommendation
**Cons:**

- QLC NAND where 500 GB-2 TB models use TLC
- Post-cache sustained writes drop to a few hundred MB/s
- Lower TBW-per-TB ratio than the TLC capacities
- No heatsink included


## Verdict

Buy the Western Digital SN5000 4TB as a bulk-storage Gen4 drive: 4 TB of single-sided M.2 with 5,500 MB/s reads, 900K random-write IOPS and five years of coverage is a strong package for game libraries, media volumes and PS5-style expansion where read speed dominates. Skip it for sustained heavy writing — the QLC NAND concedes post-cache throughput that TLC capacities keep, and a DRAM-equipped alternative holds up better there. The Crucial P3 Plus 4 TB is the like-for-like QLC rival, Samsung's 990 EVO Plus the speed-first option, and the SN5000 2 TB the pick if 2 TB is genuinely enough capacity. For a QLC capacity play executed this carefully, the SN5000 4TB earns its place in the WD Blue range.

## Frequently Asked Questions

### Is the Western Digital SN5000 4TB compatible with the PS5?

On paper, this is the best SN5000 for the PS5. Sony recommends PCIe 4.0 drives reading at 5,500 MB/s or faster with a heatsink, and the 4 TB model's 5,500 MB/s read rating meets that recommendation exactly while 4 TB suits a console library. The caveat is cooling: no heatsink is included, so buyers need a slim cooler that keeps the module within Sony's 110 x 25 x 11.25 mm limit. Tom's Hardware's 4TB review specifically framed this drive's read speed as optimal for PS5-class use.

### Does the Western Digital SN5000 4TB use QLC or TLC NAND?

QLC — and it is the only SN5000 that does. The 500 GB, 1 TB and 2 TB models use Kioxia BiCS5 112-layer TLC, while the 4 TB switches to BiCS6 162-layer QLC and a different controller, a split that Blocks & Files documented and that The SSD Review summarised as 'TLC or QLC Memory You Pick'. The practical differences: QLC stores four bits per cell for cheaper density, which is why WD can offer 4 TB at this positioning, but it concedes endurance per terabyte and sustained write throughput once the SLC cache fills.

### What is the TBW endurance of the Western Digital SN5000 4TB?

WD rates the 4 TB model at 1,200 TBW under the 5-year limited warranty, whichever arrives first. That is the biggest absolute budget in the range — double the 2 TB's 900 TBW — but the per-terabyte ratio is lower than the TLC capacities' 600 TBW-per-TB pattern, a standard QLC concession. In practice the number is academic: 1,200 TBW allows about 65 GB of writes per day across five years, and at 20 GB per day the budget lasts more than 160 years, so the warranty term is the realistic limit.

### Is the Western Digital SN5000 4TB good for gaming?

For storing and loading games, yes. The 5,500 MB/s read rating is actually the fastest in the SN5000 family, game loading is indistinguishable from any healthy Gen4 drive, and 4 TB holds an enormous library with the OS in the same volume. Installs ride the pseudo-SLC cache at rated speed. The only gaming-adjacent job it handles worse than a TLC drive is constant recording or heavy stream-capture writing to the same volume, where post-cache QLC throughput drops; keep that workload on a TLC capacity or a DRAM-equipped drive.

### Western Digital SN5000 4TB or Crucial P3 Plus 4TB?

Both are QLC-based 4 TB Gen4 drives, so the comparison is closer than most. The SN5000 holds the ratings edge at 5,500/5,000 MB/s against the P3 Plus's 5,000/3,600-class figures, and WD's in-house platform has built a stronger review track record across the family. The P3 Plus counters on retail pricing, which is typically the lowest per terabyte in the tier. Choose the WD for the better-rated performance and family consistency; choose the Crucial when the absolute lowest cost per terabyte is the deciding factor. Neither suits sustained heavy writes.

### How slow are the SN5000 4TB's sustained writes after the cache fills?

Well below the rated 5,000 MB/s. Independent reviewers consistently found that once the nCache 4.0 pseudo-SLC cache exhausts during large sustained transfers, QLC post-cache throughput settles in the few-hundred-MB/s band, with ServeTheHome's early 4 TB testing aligning with reader-reported figures around 500-600 MB/s. The cache is large on a 4 TB drive — several hundred gigabytes — so game installs and typical copies never see the drop. It only appears in continuous writes beyond the cache, such as long video ingest or full-drive cloning, where a TLC or DRAM-equipped drive finishes far faster.

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Last updated: 2026-09-27. Source: https://ssdrive.net/western-digital-sn5000-4-tb