On taking apart the Acer S7 Ultrabook, The SSD Review discovered a strange new SSD form-factor, which bears the label of Lite-On, and carrying the model number "CMT-256L3M." This is perhaps the first mSATA SSD with two independent SSD subunits, one on each side. The mSATA interface itself is modified to have two SSD ports. The drive registers on the system BIOS as two individual drives, which is then run as a 256 GB (physical) RAID 0 volume by the BIOS and operating-system.

Each of the CMT-256L3M's two subunits feature a Marvell 88S9175 controller, which supports SATA 6 Gb/s interface, two 64 GB dual-channel 24 nm toggle NAND flash memory chips by Toshiba, and a Nanya-made DRAM cache chip. Putting the drive through sequential-friendly benchmarks such as CrystalDiskMark shows a sequential read speed of the drive (combined with its two subunits) to be around 877 MB/s, with sequential writes up to 672 MB/s. Multi-subunit SSDs aren't new, most high-end consumer SSDs from the pre-TRIM, pre-SandForce era used to be dual- to quad-subunit drives. The CMT-256L3M is the first one in the super-compact mSATA form-factor, and its performance numbers could impress more Ultrabook designers.