-=PCTechTalk=- Re: - Re: Hard Disk...AGAIN!!!
- From: Jim <n1jmm@xxxxxxxxxxxx>
- To: pctechtalk@xxxxxxxxxxxxx
- Date: Tue, 09 Jul 2002 13:39:06 -0400
Your size difference typically comes from not understanding the counting
methods used and or the method the capacity is specified.
Naturally the manufacturer wants to BRAGG about the disk size, so they
typically state the size in unformatted capacity in decimal bytes.
Normal computer terms count the bytes in powers of 2, not decimal, the power of
2 method is used by the software and is always a lower number than the decimal
value.
The second thing is, the OS reports the FORMATTED capacity in powers of 2,
which is always lower than all the previous methods. This is a actual user
storage capacity and is lower because part of the disk is used by the OS for
partitioning info and format
info, thus the USER capacity is less. The amount of space used for overhead
will vary by the number of partitions created and the format used.
You can do the calculations, just devide your drives advertized capacity by
powers of 2.
This chart works best displayed with uniform font spacing.
g
b
-
1 | | m
0 5 2 1 | | b
7 3 6 3 | 6 3 1 | - | | | | | n
3 6 8 4 | 7 3 6 8 | 4 2 1 | | | k | b | i
7 8 4 2 | 1 5 7 3 | 1 0 0 5 | 2 1 | | b | y | b
4 7 3 1 | 0 5 7 8 | 9 9 4 2 | 6 3 6 3 | 1 | - | t | b b
1 0 5 7 | 8 4 7 8 | 4 7 8 4 | 2 1 5 2 | 6 8 4 2 | 1 | e | l i
8 9 4 7 | 8 4 2 6 | 3 1 5 2 | 1 0 5 7 | 3 1 0 0 | 0 5 2 1 | - | e t
2 1 5 2 | 6 3 1 0 | 0 5 7 8 | 4 7 3 6 | 8 9 9 4 | 2 1 5 2 | 6 3 1 | - -
4 2 6 8 | 4 2 6 8 | 4 2 6 8 | 4 2 6 8 | 4 2 6 8 | 4 2 6 8 | 4 2 6 8 | 4 2 1 0
3 3 3 2 | 2 2 2 2 | 2 2 2 2 | 2 1 1 1 | 1 1 1 1 | 1 1 1 9 | 8 7 6 5 | 4 3 2 1 <
Bit #'s
2 1 0 9 | 8 7 6 5 | 4 3 2 1 | 0 9 8 7 | 6 5 4 3 | 2 1 0
82.3gb
82,300,000,000 bytes (decimal)
/ 1,073,741,814
= 76.6478 gb
-Jim-
andy wrote:
>
> ----- Original Message -----
> From: "keith" <kword88@xxxxxxxxxxx>
> To: <pctechtalk@xxxxxxxxxxxxx>
> Sent: Tuesday, July 09, 2002 12:11 PM
> Subject: -=PCTechTalk=- Re: Hard Disk...AGAIN!!!
>
> >
> > Have you checked for a BIOS update? Or did the drive come with "drive
> > overlay software" ? Is it possible to manually input the drive
> > parameters in the BIOS ?
>
> The bios is showing the correct size, so thats not where the problem lies,
> it's when I try to fdisk and set the partitions that the size is showing
> wrong (12993mb instead of 82.3gb) The motherboard is only a couple of
> months old anyway, and it is ATA33/66/100 compatible.
>
> ANYWAY.....I have a bit of success
>
> The drive itself came with absolutely no software (It's an IBM Deskstar 120
> gxp 82.3gb) but I have downloaded the disk manager software from their
> website . With that, the size is showing as 76gb!!! I've used that to
> partition and format into the sizes that I want and all seems well now, even
> though I am 6 gb short of the size advertised..quite why, I don't know!!
>
> Now, the next bit will come when I try to use Drive Copy to move my o/s..I
> hope that goes smoother, but somehow, I doubt it!!!
>
> One other question..when I was setting up the hard drive on the IBM disc
> manager, I noticed it asked whether I was going to be using the partition as
> storage or for an o/s-any idea why it asked this? I thought as long as a
> partition was formatted ok, it could be used for anything?
>
> Cheers
>
> Andy
>
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