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Windows 7: Missing Hard Drive Memory?

15 Jun 2012   #1
Chips

Windows 7
 
 
Missing Hard Drive Memory?

I've just had a Corsair SATA 120Gb hard drive installed in my new computer. Trouble is when I checked how much memory I've got it said that it's only 111Gb in total with 67Gb free! I understand that a big chunk of memory would be taken up with basic systems memory, but it said I only have a drive with 111Gb in TOTAL, not the 120Gb as it says on the box! Can anyone explain where all the memory's gone?


My System SpecsSystem Spec
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15 Jun 2012   #2
DeaconFrost

Windows 7 Ultimate x64 SP1
 
 

For the record, memory and hard drive space are two separate things. That being said, hard drives have always had lower actual sizes than advertised. For years, the explanation was printed on the sides of the boxes, but it's become common knowledge, so the warnings typically aren't printed anymore.

A gigabyte isn't 1000 megabytes, it's 1024 megabytes. A megabyte isn't 1000 kilobytes, it's 1024....and so on. 111 GB of actual space on a 120 GB drive is normal.
My System SpecsSystem Spec
15 Jun 2012   #3
Dwarf

Windows 8.1 Pro RTM x64
 
 

Been explained numerous times before. It's all to do with marketing, and how the term Giga is represented. Many HDD manufacturers market drives using the decimal version of Giga, which is 10^9. The computer, on the other hand, works in binary and its version of Giga is represented by 1024^3

Let's do the sums.

As marketed: 120 x 10^9 = 120,000,000,000 bytes

What the computer sees: 120,000,000,000 / 1024^3 = 111.76
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15 Jun 2012   #4
DeaconFrost

Windows 7 Ultimate x64 SP1
 
 

That's a much better explanation than my answer.
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15 Jun 2012   #5
Chips

Windows 7
 
 

Ahhh, riiight....that all makes logical sense.... Thanks anyways. Knew you'd all have the answer to my rather perplexing problem.
My System SpecsSystem Spec
15 Jun 2012   #6
Chips

Windows 7
 
 

One little thing. Is it the same with solid state drives?
My System SpecsSystem Spec
15 Jun 2012   #7
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Quote   Quote: Originally Posted by Chips View Post
One little thing. Is it the same with solid state drives?
Yes.

Although, a recent thread suggested that maybe Samsung's SSD advertised GB is the same as what Windows recognizes.
My System SpecsSystem Spec
15 Jun 2012   #8
Chips

Windows 7
 
 

Thanks for the info!
My System SpecsSystem Spec
15 Jun 2012   #9
Dwarf

Windows 8.1 Pro RTM x64
 
 

Generally speaking, drive capacities (whether HDD or SSD) are quoted using the decimal version of Giga. Unfortunately, not all are and, to add to the confusion, even drives from the same manufacturer can be labeled either way.
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 Missing Hard Drive Memory?




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