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 Maj ieetglue Most hard drive sizes are measured in megabytes and gigabytes but most people do not know that there is a difference between binary and decimal megabytes/gigabytes. The difference is often confusing to people but it's due to the way manufacturers and sofware makers calculate drive capacity. Technically, hard drive capacity is calculated by multiplying the number of cylinders, sectors, and heads times 512 like Capacity = Cylinders x Heads x Sectors x 512 (bytes per sector) example: 1654 x 16 x 63 x 512 = 853,622,784 bytes 7752 x 16 x 63 x 512 = 4,000,776,192 bytes Uh whatever, but manufacturers use MB/GB ! Right? True, to calculate the notaion of MB or GB just divide the drive size by 1,000,000 for MB or 1,000,000,000 for GB 853,622,784/1,000,000 = 853.6MB 4,000,776,192/1,000,000,000 = 4.0GB Makes sense right? The problem is that many software makers will use binary to calculate drive sizes. A binary MB is 1,048,576 bytes, and a binary GB is 1,073,741,824 bytes so a lot of sofware will report 853,622,784/1,048,576 = 814MB 4,000,776,192/1,073,741,824 = 3.72 GB So simply put there are two slighty different ways of representing the same drives, both methods are correct. The important issue is the people recognize the difference and not mistake the difference as a problem with the drive. ;) glue Replies:
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2003-12-14 03:42:30
2003-12-24 05:21:10