After a hard disk is formatted, the Finder shows the "available" storage
in kilobytes. With a given drive, this number varies with the version of
HD Setup software used. For example:
Drive HD Setup 1.3 HD Setup 1.5
--------------------------------------
HD 40SC 41,439K 39,333K
HD 80SC 76,911K 76,869K
To calculate the drive's capacity in bytes, multiply the number of
kilobytes (K) by 1,024. To calculate the drive's capacity in megabytes,
divide the number of kilobytes by 1,024. The capacity of the drives after
being formatted with HD Setup 1.5 is:
HD 40SC 39,333K = 40,276,992 bytes = 38.4MB
HD 80SC 76,869K = 78,713,856 bytes = 75.1MB
The sizes of formatted drives varies between manufacturers, depending on
the intelligence of the drive controller. Some drive controllers spare bad
blocks automatically or allocate a range of blocks that can be swapped with
bad blocks. It is the industry practice to quote the size of a formatted
drive even though the size of the drive will vary depending on the operating
system with which the drive is formatted.