Can´t use the full drive capacity

[Feletono]

hi, I have a question, i have a hitachi 80 gbs hard drive but my system only detects 75 gbs (maybe just 73 gbs).I double checked everything (jumpers) but its all the same.

what do ya think?

 

[Frank4d]

73 to 75GB looks about right. The discrepancy occurs primarily because some drive manufacturers define 80GB as 80,000,000,000 bytes, which is really 85,899,345,920 bytes. The MBR also takes a small amount of space.

So a Hitachi 80GB drive is 74.5GB. But a Seagate 80GB drive really is 80GB.

 

[LWComputingMVP]

Frank4d has essentially given you an answer - to put it a slightly different way,

Manufacturers advertise the drive sizes where 1 GB = 1 billion bytes. BUT, to a computer, which does math in binary, 1 GB = 2^30 or 1,073,741,824 bytes.

So if we take the manufacturer's standard of 80,000,000,000 bytes and divide by the computer's interpretation, we get

80,000,000,000
-------------- = 74.5 GB to the Computer
1,073,741,824

Note: the actual size often will be slightly more or slightly less because the drive is not going to simply stop making space available at 80 GB/74.5 GB. There's usually a little more usable space or maybe a little less (figure the variation could be as much as a full GB.

 

[Feletono]

THX a Lot !!!!