40 gig hard drive says 37.2

  ALAN-257867 09:39 17 May 2003

I have 2 40gig hard drives both the same specs
my bios says they are 40gig but if i go into "my comp" they are both showing has 37.2 total size each.
i have run fdisk but there are no partitions.
I want to partition them, 2 on each drive but i want my 5.6 gig back.
i run windows xp pro.
Can anyone help please.

  goonerbill 09:45 17 May 2003

this has been said before ( could do with FAQ section on web site ) but your h/drives are correct. makers say a mb is 1000bytes but in reality its 1024bytes. that is where ya lost space has gone but it aint as it was never there.

  ALAN-257867 09:57 17 May 2003

Thanks for the quick response.

I formatted my hard drives useing two discs of seagate.
before i done this they were showing has 40gig each.
anymore ideas greatly received

  Ironman556 10:11 17 May 2003

As goonerbill said, the makers (I assume Seagate) probably use 1000 bytes as a megabyte not 1024, so their installation disks would also report 40 gigs. I have a 60 gig Seagate, but windows reports 55.4 gigs. Same problem, but unfortunately no fix for it.

The other alternative is that you lost some space formatting the drive, but I'm not sure how that works or if you'd lose that much.

  Elrond 10:19 17 May 2003

My dad's Maxtor 40GB also only shows 37.5GB. And my 30GB maxtor only comes out at around 28GB. It's just the way they work

  ALAN-257867 10:38 17 May 2003

Cheers for that everyone

Ironman556 you was right they are seagate(both) st340016a.

it just seems strange i used there floppy discs to format both drives and now i have 37.2 on each drive.

maybe it is lost. maybe there is a way to get it back.
I will keep this thread open for anymore suggestions.
thanks again to you all

  jazzypop 11:05 17 May 2003

To allow you to relax and close the thread, can I offer the following explanation? It is not really different to the good advice you have already been give - just a little more detailed.

1. The 40GB refers to the unformatted capacity of the drive. Formatting always carries an overhead (a loss of storage capacity).

2. The drive manufacturer is using the value of 1000 bytes for a kilobyte (KB), and 1000 kilobytes for a megabyte (MB), and 1000KB for a Gigabyte(GB).

If you take 40 x 1000 x 100 x 1000, you end up with 40,000,000,000 bytes (manufacturer states as 40GB).

However, the operating system (Windows) uses the values of 1024 bytes = 1 KB, and 1024 KB = 1MB, and 1024 KB = 1GB.

So, 40,000,000,000 divided by 1024 = 39,062,500 (KB)

39,062,500 divided by 1024 = 38,146.98 (MB)

Therefore, Windows always would have reported your '40GB' drive as having a capacity of 38.1GB, before losing capacity to the formatting overhead.

See also click here

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