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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

  • Device TypeInternal Solid State Drive (SSD)
  • Form Factor2.5"
  • Capacity256GB
  • Memory ComponentsTLC
  • InterfaceSATA III
  • Max Sequential ReadUp to 540 MBps

Options 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.

Highlights

  • 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

Specifications

BrandSanDisk
SeriesX400
ModelSD8SB8U-256G-1122
Device TypeInternal Solid State Drive (SSD)
Form Factor2.5"
Capacity256GB
Memory ComponentsTLC
InterfaceSATA III
Max Sequential ReadUp to 540 MBps
Max Sequential WriteUp to 520 MBps
4KB Random ReadUp to 93,500 IOPS
4KB Random WriteUp to 75,000 IOPS
MTTFUp to 1.75M hours
FeaturesUP TO 1TB IN A SINGLE-SIDED M.2 2280 AND 2.5" 7MM FORM FACTORS
NCACHE 2.0 MAXIMIZES READ/WRITE OPERATIONS AND IMPROVES RESPONSIVENESS
GREATER RELIABILITY WITH DATAGUARD CLIENT AND THE NEW LDPC ERROR CORRECTION MECHANISM
AVAILABLE IN 128GB, 256GB, 512GB, AND 1TB CAPACITIES IN BOTH 2.5" 7MM AND M.2 2280 FORM FACTOR
BETTER SLUMBER MODE FOR GREATER LOW POWER EFFICIENCY
TCG OPAL 2.0 SUPPORT
Operating Temperature0°C ~ +70°C
Storage Temperature-55°C ~ +85°C
Max Shock Resistance1500G
Max Vibration ResistanceOperating: 5.0 gRMS, 10 - 2000 Hz
Non-operating: 4.9 gRMS, 7 - 800 Hz
Height7.00mm
Width69.85mm
Depth100.00mm
Weight37.40g
Shipping weight0.06 kg
Package size156 × 122 × 18 mm

Other versions of this model

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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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