When Apple updated the new MacBook Air, they shipped it with a Toshiba SSD (TS###C), but recently Apple has changed its SSD supplier and now they ship Samsung’s (SM###C). The difference in R/W speed is quite big.
As Anandtech, who discovered the new SSD drives, states:
There is no absolute confirmation yet that Samsung manufactures the SM128C, but all indicators point that way. Regardless of manufacturer, the SM128C appears noticeably faster in sequential read/write performance. What we can’t confirm is how the two models differ in more intense testing
If you want to know which model you have, you can find that information in System Profiler > Hardware > Serial-ATA.
At the moment, it is unknown if the new SSDs support TRIM. Mac OS X Lion will support it natively, but if you don’t want to wait until the launch of Lion, you can use this hack to enable it in Mac OS X Snow Leopard.
[via OS X Daily]