Why is my Hard disk size smaller than the one i bought?
Reasons:
Hard disk size is measured in decimal units, e.g. a WD
640 GB contains 640 Billion Bytes of space
BUT, the hard disk size is smaller than what is actually
bought.
Assuming you have only one partition on the hard disk
Your computer reads Computer size in binary not in
decimal, but computer hard disk sizes are made in
decimal numbers
Thus 1 kilobyte of data is actually 2^10 bytes, not 1000
bytes
2^10 = 1024 bytes
1 mb ~ 1thousand kilobytes = 2^10 * 2^10 = 2^20 =
1024 x 1024 = 1 048 576 bytes, not 1 000 000 bytes
1 gigbyte ~ 1 thousand megabytes = 2^10 * 2^10 *
2^10 = 2^30 = 1024x1024x1024 = 1 073 741 824 bytes
So 640 GB or 640 Billion Bytes Decimal is actually 640
000 000 000 / 1024^3 = 596.046 GB
some space may not be allocated, as 8mb is unallocated
when a new partiton is created.
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