The MK2109MAF was the world’s thinnest 2.5-inch magnetic disk unit (6.35 millimeters thick). Toshiba began shipping the unit in 1998.
The data volumes computers handled were soaring year by year. At the same time, the market was demanding smaller and lighter notebooks while expecting the performance of desktops and high-end notebooks. These demands meant thinner magnetic disk units had to be built. The MK2109MAF used only one disk to achieve a profile of just 6.35 millimeters, but it increased the recording density to provide 2.1 GB of data storage.
At the same time, Toshiba began shipping the 4.3 GB MK4309MAT that used the same technology for an 8.45 millimeter profile.
|Average seek time||13ms|
|Data transfer speeds||33.3MB/s
（Ultra DMA Mode-2）
|External dimensions [mm]||70 x 100 x 6.35 (w x d x h)||70 x 100 x 8.45 (w x d x h)|
|Weight||89 grams||95 grams|
|Energy consumption efficiency||0.00037W/MB||0.00020W/MB|