I know the Recovery drive takes up 650MB, but where is the other 7.25GB?
128GB is really only 128,000,000,000 bytes instead of 137,000,000,000 bytes. So the actually drive is only roughly 124GB after conversion. Minus OS and Recovery drive bring it down to 120ish.
Edit: After rechecking my math, 120GB is just over 128,000,000,000 bytes.
Yes, but Lion, and I think SL, use 1000 not 1024
I know the Recovery drive takes up 650MB, but where is the other 7.25GB?
True, but SSDs are quoted based on their absolute size, which includes amounts that the controller sets aside for low level operations such as overprovisioning, wear leveling, and garbage collection (i.e. not available for data storage). The actual capacity of the 128GB SSD is about 121GB, while the 256GB capacity is actually about 250GB using the base 1000 system.
Yes, but Lion, and I think SL, use 1000 not 1024
Yes, but OS X Lion tends to show the full size. It does with my other SSD's and HDD's