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I have 1TB disk, but the system tell me it was 931GB disk?
Posted by - NA - on 11 January 2011 17:40
Hard drive manufacturers market drives in terms of decimal (base 10) capacity. In decimal notation, one megabyte (MB) is equal to 1,000,000 bytes, one gigabyte (GB) is equal to 1,000,000,000 bytes, and one terabyte (TB) is equal to 1,000,000,000,000 bytes.

Please refer to the following links,

In the table below are examples of approximate numbers that the drive may report. The read capacity might different accoding difference harddisk manufacturer and models.

Decimal         MB (Binary)
Windows Output (Binary)
20 GB 19,073 MB 18.6 GB
40 GB 38,610 MB 37.3 GB
60 GB 57,220 MB 55.8 GB
80 GB 76,293 MB 74.5 GB
120 GB 114,440 MB 111.7 GB
160 GB 152,587 MB 149 GB
250 GB 238,418 MB 232 GB
320 GB 305,175 MB 298 GB
400 GB 381,469 MB 372 GB
500 GB 476,837 MB 465 GB
640 GB 610,351 MB 596 GB
750 GB 715,255 MB 698 GB
1 TB (1000 GB) 953,674 MB 931 GB
1.5 TB (1500 GB) 1,430,511 MB 1,396 GB
2 TB (2000 GB) 1,907,348 MB 1,862 GB
3 TB (3000 GB) 2,861,022 MB 2,793 GB
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