Some manufacturers specify formatted sizes and some specify unformatted size some just give a size and don't really say what it is. Also be aware that because of differences in drive geometry, formatting at both low and high levels cause size differences from specification sheets.
Take your pick! We use the implied standard of storage that 1MB is 1,000,000 bytes. Some, such as Western Digital, define a storage MB as 1,000,000 bytes and a storage GB as 1,000,000,000 bytes while others define them as 1,048,576 and 1,073,741,824 respectively. Be aware that from manufacturer to manufacturer, there is no real standard for disk and storage specifications. Click on Calculate to see the results for the disk or diskette. Tracks = Heads x Cylinders.) Finally, enter the number of bytes per sector. (The number of tracks will be calculated for you.
Enter the number of cylinders and the number of sectors per track. Enter the number of heads on the drive, one for each platter media surface. If the specifications give you both, you may use either they will be reasonably close if not exact. Often with newer and larger drives, the actual number of heads, cylinders and sectors are not the physical number but are translated numbers. The required data for this calculator is normally in the disk information printed on the drive. This calculation works with hard disks and removable disks as well. This calculator requires the use of Javascript enabled and capable browsers.
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