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120gb Drives showing as 111gb?Please discuss

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Puer Aeternus

Member
Joined
Sep 23, 2001
Location
In your head (Ottawa.Canada)
In this Thread Dark_15 explained a little about HD's not showing the advertised storage capacity.
Can anyone expound a little on this?

Background story first: MY roomie has a Soyo Kt600 mobo(same as me). He has a regular 120 drive on a promise controler. His drive shows as 110gb. I just put a 120 sata drive in my mobo and it shows as 111gb. A quick browse on google shows a few others w/ the same prob. However in the thread linked above and verified by a Moderator at PC Perspective this is not a prob but normal for large drives!?!?!
 

Sonny

Senior TIFOSI
Joined
Aug 3, 2001
Location
VARIANTE ASCARI
HDD Manufacturers use 1000MB as being equal to 1GB and some add the Buffer Size as part of the Total Storage Capacity. The OS will recognize 1GB as 1024MB, with a little math you'll arrive at your numbers.
 

kct2

Member
Joined
Feb 20, 2002
Hard drive manufactures rate 1GB as 1,000,000,000 bytes, while the OS sees 1,073,741,824 (1024³) bytes as a GB. Use that and the math will come out right.

As to why it is reporting differently in the OS, all I can guess is you are using different operating systems, or file systems, or brand of drive. If everything IS the same, then it must have something to do with the driver for the promise card. But nothing is wrong.
 

David

Forums Super Moderator
Joined
Feb 20, 2001
kct2 said:
Hard drive manufactures rate 1GB as 1,000,000,000 bytes, while the OS sees 1,073,741,824 (1024³) bytes as a GB. Use that and the math will come out right.

As to why it is reporting differently in the OS, all I can guess is you are using different operating systems, or file systems, or brand of drive. If everything IS the same, then it must have something to do with the driver for the promise card. But nothing is wrong.


The manufacturer says 120GB, which they mean as 120,000,000,000 bytes.

120,000,000,000 bytes = 117187500 kb = 114441 MB = 112GB (numbers approximated slightly).

If your drive is slightly different from his (diff model) it may have slightly more space on it, but still ~120GB by manufacturer's standards, yet 111 GB by windows. Whereas his is ~120GB according to manufactuer but actually 110GB.