hdd reads lower and what it shoud be why?

Rol87 · Jan 7, 2008

I just got a new (has been owned before) hard drive and its supposed to be a 500gb and it only reads it as a 465gb along with my old one it said that it was a 250gb and it would only be read as a 235gb why is that?

[I.R.A]_FBi · Jan 7, 2008

because there is a difference in how manufacturers report hard rive capacity and how the os sees it

ShadowFold · Jan 7, 2008

most of it is for the OS

trog100 · Jan 7, 2008

the formatting and fat table stuff occupy space.. it comes off the total..

trog

Rol87 · Jan 7, 2008

ShadowFold said:
most of it is for the OS

I dont think that my os takes 20+ of gb

Dr. Spankenstein · Jan 7, 2008

Well divide by 1024 for MB and you get 488.28 and 244.14. Still leaves aprox. 9Gb unaccounted for. Looks like it's time for a low-level format.

hat · Jan 7, 2008

The manufacturer counts one megabyte as 1000 killabytes, the OS counts one megabyte as 1024kb.

My 250gb is seen as 232gb.

Beertintedgoggles · Jan 7, 2008

Here is how it goes:
500GB to the marketers = 500,000,000,000 bytes

divide this by 1024 for KB
divide again by 1024 for MB
divide once more by 1024 for GB

so: 500,000,000,000/(1024*1024*1024) = 465GB

so 500GB according to the sales guys = 465GB (base two)

francis511 · Jan 8, 2008

In fact , Seagate (?) were sued recently for misrepresenting their hard drives this way . It`s not that big a discrepancy, You DO get five hundred gigabytes (base 10)

Rol87 · Jan 8, 2008

o ok i see i was about to freak out i was like there is no way that the os takes that much of gb :slap:

another thing since i now have to hdd can i use Norton Partition Magic to make a copy of the old hdd for the new one?

hat · Jan 8, 2008

The os dpesn't make your hard drive appear smaller than it should, it takes up space just like anything else does, and is accounted for in the "used space" area of the hard drive pie graph.

AsRock · Jan 8, 2008

trog100 said:
the formatting and fat table stuff occupy space.. it comes off the total..

trog

+1. Shame Manufacturers don't actually give you 500GB after format ...

Deleted member 3 · Jan 8, 2008

The issue is, as Beertintedgoggles mostly explained, the difference between 1000 and 1024. HD manufacturers clearly state that 1 GB = 1.000.000.000 bytes. This is correct.

Kilo means 1000, mega means million, these are official SI units. However many years ago these same units were used in computers, a kilo became 1024 here. This is wrong, 1024 is a KiloBinary, ie a KiBi or (2^10). 1024KiBi would be MeBi, megabinary (2^20). Giga would be Gibi (2^30) and so on.

Few programs actually use these right SI units, torrent clients for example mostly do, they list KiB instead of KB and GiB instead of GB. Windows however reads the right units but names them wrong. This is not a reason to bash Windows, as nearly all OSes and other programs do this.

It's just a nice confusing thing in the industry. It won't change anytime soon.

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hdd reads lower and what it shoud be why?

Rol87

[I.R.A]_FBi

ShadowFold

New Member

trog100

Rol87

Dr. Spankenstein

hat

Enthusiast

Beertintedgoggles

francis511

Rol87

hat

Enthusiast

AsRock

TPU addict

Deleted member 3

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