Re: XP does not see all of a WD 160GB drive that was added as a slave

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From: John (anonymous_at_discussions.microsoft.com)
Date: 02/03/04 

Date: Tue, 3 Feb 2004 15:59:53 -0800

Thanks Carey!!!!!

I knew that was a possibility but discounted it as such
because I never dreamed the gap would be so large!!!!

John

>-----Original Message-----
>>From the Western Digital website:
>
>Determining drive capacity can be confusing at times
because of the different measurement standards that are
often used. When dealing with Windows and Mac based
systems, you will commonly see both decimal measurements
and binary measurements of a drive's capacity. In either
case, a drive's capacity is measured by using the total
number of bytes available on the drive. As long as the
drive displays the correct number of bytes (approximate),
you are getting the drive's full capacity.
>
>Decimal vs. Binary:
>For simplicity and consistency, hard drive manufacturers
define a megabyte as 1,000,000 bytes and a gigabyte as
1,000,000,000 bytes. This is a decimal (base 10)
measurement and is the industry standard. However,
certain system BIOSs, FDISK and Windows define a megabyte
as 1,048,576 bytes and a gigabyte as 1,073,741,824 bytes.
Mac systems also use these values. These are binary (base
2) measurements.
>
> To Determine Decimal Capacity:
> A decimal capacity is determined by dividing the total
number of bytes, by the number of bytes per gigabyte
(1,000,000,000 using base 10).
>
> To Determine Binary Capacity:
> A binary capacity is determined by dividing the total
number of bytes, by the number of bytes per gigabyte
(1,073,741,824 using base 2).
>This is why different utilities will report different
capacities for the same drive. The number of bytes is the
same, but a different number of bytes is used to make a
megabyte and a gigabyte. This is similar to the
difference between 0 degrees Celsius and 32 degrees
Fahrenheit. It is the same temperature, but will be
reported differently depending on the scale you are using.
>
>
>
>---------------------------------------------------------
-----------------------
>
>
>
>Various Drive Sizes and their Binary and Decimal
Capacities
>
>
>
> Drive Size in GB Approximate Total Bytes Decimal
Capacity
> (bytes/1,000,000,000)
> Approximate Binary Capacity (bytes/1,073,724,841)
> 10 GB 10,000,000,000 10 GB 9.31 GB
> 20 GB 20,000,000,000 20 GB 18.63 GB
> 30 GB 30,000,000,000 30 GB 27.94 GB
> 40 GB 40,000,000,000 40 GB 37.25 GB
> 60 GB 60,000,000,000 60 GB 55.88 GB
> 80 GB 80,000,000,000 80 GB 74.51 GB
> 100 GB 100,000,000,000 100 GB 93.13 GB
> 120 GB 120,000,000,000 120 GB 111.76 GB
> 160 GB 160,000,000,000 160 GB 149.01 GB
> 180 GB 180,000,000,000 180 GB 167.64 GB
> 200 GB 200,000,000,000 200 GB 186.26 GB
> 250 GB 250,000,000,000 250 GB 232.83 GB
>
>
>--
>Carey Frisch
>Microsoft MVP
>Windows XP - Shell/User
>
>Be Smart! Protect your PC!
>http://www.microsoft.com/security/protect/
>
>---------------------------------------------------------
----------------------------------------
>
>"John" <anonymous@discussions.microsoft.com> wrote in
message:
> news:976a01c3eaab$04c32170$a001280a@phx.gbl...
>
>| I am having the same problem with Windows XP Home
edition
>| when I attempted to add a new WD 160GB drive. I have
read
>| many articles and have done the following:
>|
>| 1) Service Pack 1 is installed
>| 2) My Atapi.sys file is version 5.1.2600.1135
>|
>| My Bios sees the drive as 160 GB.
>| My Device Manager/Disk Drives sees it as 152625MB.
>| Disk management sees it as 149.05GB.
>|
>| I have initialized the disk but have not yet
partitioned
>| or formatted the drive.
>|
>| Why doesn't XP see the full drive and how do you fix
this
>| problem???
>|

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