Home  ›  2.5-Inch SSDs (MLC)  ›  Micron/Crucial  ›  RealSSD C400/Crucial m4

RealSSD C400/Crucial m4

Crucial m4The RealSSD C400 is the successor to the C300, which was released under Micron’s consumer brand Crucial. It will also be available under the name Crucial m4 for the consumer market. The C400 is also an MLC-based 2.5-inch solid state drive that uses the SATA 3 interface to boosts speeds beyond the limitations of SATA 2 (although they are backwards-compatible).

With the C400, Micron has made further improvements to the drive architecture and enables them to reach speeds of up to 415 MB/s in sequential reads and 260 MB/s in sequential writes, compared to the C300’s 355MB/s and 215MB/s, although these numbers vary between different capacities in favor of the larger ones. Available capacities in the C400 series range from 64GB to 512GB, meaning that the largest capacity is twice that of the largest C300 drive.

The 256GB and 512GB drives offer the read/write speeds mentioned above as well as 50,000 IOPS in random write performance. In the 128GB model, the write speeds go down to 175MB/s and in the 64GB model, 95MB/s. IOPS write performance for the 128GB and 64GB drives are 35,000 IOPS and 20,000 IOPS, respectively.

Another key difference is the move to the less robust 25nm NAND flash. This drive’s main competitors are the similar Intel 510 series (34nm) and Corsair’s Performance 3.


  • Sequential Read: 415 MB/s
  • Sequential Write: 260 MB/s (varies with capacity)
  • Interface: SATA 3
  • NAND Type: MLC
  • Controller: Marvell
  • Form Factor: 2.5 inch
  • DRAM Cache: 128 MB
  • Voltage: 5V ±5%
  • Power Consumption (active): 160mW
  • Power Consumption (idle): <85mW
  • TRIM Support: Yes
  • S.M.A.R.T. Support: Yes
  • MTBF: N/A

Manufacturer’s product page.

Pricing and Availability:

[pcu id=4]



Overall Crucial has a faster drive on its hands, one that’s particularly well suited to most of our lighter workloads.


An evolution of an architecture which has proven its high performance, reliability and compatibility the m4 stretches Crucial’s performance lead over SATA 2 drives and ensures they are competitive with the latest SATA 3 models.


Comments are closed.

Help us improve the wiki Send Your Comments