For a start the hard drive manufacturer defines 1Kb as 1000b not 1024b as the computer does. This goes right through the process i.e. 1Gb = 1000Mb not 1024Mb.
Thats why my 61Gb drive is actually only a 55.89Gb drive.
This wasn't really noticeable when the drives were only 540Mb but now that we are talking Gb's its more prominent.
(Controller issue, not letting you see the xtra space, notwithstanding)
Pardon?
Most manufacturers advertise and sell drives by their *unformatted* capacity.
The system profiler, Finder, etc, sees drives 1) by their *formatted* capacity. 2) after the bad blocks have been subtracted. 3) after overhead is deducted for the partition and file structure maps.
That accounts for the storage difference, not the 24 bytes/KB.
Now, if you want to get more technical... those 24 bytes are still there (and often more, depending on the manufacturer). They're part of the hardware ECC.
- Dan.
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