Where's all my HDD space going?

mvealey

Honorable
Sep 5, 2013
2
0
10,510
All;

I have a 160gb drive that I want to use as a backup for my photos but when I look at in Manage (this is a Win Vista machine) it says I only have 149gb available. (That is also just about 1gb short of being able to back up all my pictures...)

What is that 11gb being used for and is there some why I can recover it? I checked for bad sectors and there are none. I tried doing a low level format but with the same result.

This is strictly a hot swappable backup, not a bootable drive. I know there are system files there but 11 gig's worth?!?!?

Any information would be helpful.
 
Solution
It's because windows considers 1GB to be 1024^3 bytes, whereas the manufacturers consider 1GB to be 1000^3. 160GB in manufacturer space is equivalent to about 149GB in actual space.

Kelthar

Honorable
Mar 27, 2013
640
0
11,360
It's because windows considers 1GB to be 1024^3 bytes, whereas the manufacturers consider 1GB to be 1000^3. 160GB in manufacturer space is equivalent to about 149GB in actual space.
 
Solution
Hard drive makers list things in multiples of 1000 while computers use 1024

so if you have a 160gigabyte drive it is 160000000000 bytes /1024 = 156250000 kilobytes / 1024 = 152587.890625 megabytes \ 1024 =149.0116119384766 gigabytes

Its 100% normal and how it has always been.
 

RealBeast

Titan
Moderator
Sorry but that is a marketing problem -- you only get about 93% of what you expect due to the way that manufacturers state their capacity. For example my 480GB Intel SSD has a capacity of 479,996,145,664 bytes (what Intel calls 480GB), which really equals 447GB. It's all about binary vs. base10.