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Rectangular 2.5 inch SSD with silver metal casing and black label showing SanDisk X400 256GB

SanDisk

SanDisk SD8SB8U-256G-1122 X400 2.5" 256GB SATA internal SSD

SKU CH-1Y9K-KWACX MPN SD8SB8U-256G-1122

2.5-inch SATA internal SSD with 256 GB capacity, up to 540 MB/s read and 520 MB/s write speeds, and 1.75M hours MTTF

  • Total capacity256 GB
  • Sequential read speedUp to 540 MB/s
  • Sequential write speedUp to 520 MB/s
  • Interface typeSATA III
  • Form factor2.5 in (6.35 cm)
  • Product typeInternal Solid State Drive (SSD)

Model 256GB

  • Up to 540 MB/s sequential read for fast boot and load times
  • Up to 520 MB/s sequential write for quick file saves and transfers
  • 93,500 IOPS random read for responsive multitasking
  • 75,000 IOPS random write for smooth heavy workloads
  • 75M hours MTTF with DataGuard and LDPC for long-term data protection

SanDisk X400 256GB SATA SSD

The SanDisk X400 256GB drive is a 2.5-inch internal solid state drive using SATA III interface and TLC memory. It suits users upgrading laptops or desktops that need reliable solid-state storage for everyday workloads. The 7mm height fits standard drive bays in many systems.

Fits 2.5-inch SATA drive bays

This 2.5-inch 7mm drive connects through a standard SATA III port and requires a matching power connector inside the chassis. It replaces mechanical hard drives directly without extra brackets in most laptops and desktops. The single-sided M.2 variant exists but this unit uses the cased 2.5-inch form factor.

Sustained performance with error correction

Sequential speeds reach up to 540 MBps read and 520 MBps write while random performance hits 93,500 IOPS read and 75,000 IOPS write. nCache 2.0 technology optimises read and write operations during extended use. DataGuard client and LDPC error correction protect data integrity across the 0°C to 70°C operating range. MTTF is rated up to 1.75M hours with endurance up to 320 TBW.

How it compares

Measured against everything we stock in Internal NVMe & SATA SSDs, at today’s prices. Recalculated every night.

Price $77.99
Cheaper than about 79% of the 1,994 comparable items (median $180.49).
Total capacity 256 GB
Lower than about 80% of the 1,368 comparable items (median 1 TB).
Sequential read speed Up to 540 MB/s
Lower than about 83% of the 1,180 comparable items (median 2,400 MB/s).
Price per TB $304.65 per TB
Pricier than about 76% of the 1,362 comparable items (median $165.50 per TB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameSanDisk
Product lineX400
Model nameSD8SB8U-256G-1122
Total capacity256 GB
Product typeInternal Solid State Drive (SSD)
Performance
Sequential read speedUp to 540 MB/s
Sequential write speedUp to 520 MB/s
Random read (4K)Up to 93,500 IOPS
Random write (4K)Up to 75,000 IOPS
Storage
NAND flash typeTLC
Ports & slots
Interface typeSATA III
Size & build
Form factor2.5 in (6.35 cm)
Overall height7 mm
Overall width69.85 mm
Product depth100 mm
Product weight37.4g
Shipping weight0.06 kg
Package size156 × 122 × 18 mm
Environment & compliance
Operating temperature range0 °C to 70 °C
Storage temperature range-55 °C to 85 °C
Max shock tolerance1500G
Vibration toleranceOperating: 5.0 gRMS, 10–2000 Hz
Non-operating: 4.9 gRMS, 7–800 Hz
More details
Mean time to failureUp to 1.75M hours

Other versions of this model

3 more in the same range

Questions about this item

Will this 2.5-inch drive fit a laptop bay that requires a 7mm height?

Yes, the drive is 7.00mm tall, matching the standard 7mm cased form factor used in most modern laptops.

Does the SATA III interface work with an older motherboard that only has SATA II ports?

The drive is backward compatible and will operate at SATA II speeds when connected to a SATA II port.

What operating temperature range is safe for this SSD in a desktop chassis?

The drive is rated for 0°C to 70°C during operation, which covers typical desktop environments.

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