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My current system is running XP with a Maxtor 80GB hard drive on a Asus A7v333 motherboard.
I have installed a second hard drive Deskstar 180GXP 185.2GB - as a slave. When I boot up my BIOS says it is 185GB but XP says it is only 127GB. XP also says my 80GB hard drive is only 74.5GB. Can anyone tell me where the other 58GB from my new drive has gone?

Windows kinda loses part of the drive like a certain % of it you dont really notice it in like a 20 gig but like my 120gb it only shows like 115 i think and a 80 shows up like 79 or something like that.

Hard drive manufacturers cheat by saying that 1 megabyte is 1000 bytes, when it is in fact 1024 bytes. That explains the difference with the 80GB but the difference with the 185GB seems a bit large.

I believe windows has a problem with drives larger than 132gb. Check the Windows site to see if it applies to XP.

Windows xp does not have a problem with drives over 132GB. Possum is correct, Hard drive manufacturers lie, A GB is 1,024 bytes, but they use 1000 bytes=1000.

"my BIOS says it is 185GB but XP says it is only 127GB."
The difference in defining the size between the manufacturers and windows will not account for this large a difference.

Your motherboard doesn't support hard drive greater than 127GB. You might want to look for a BIOS update from Asus website and see if they have any release that will fix the 127GB Max Hard Drive. Otherwise, return the hard drive and get a 120GB.
180GB = 180,000,000,000 bytes. = 167.63GB
80GB = 80,000,000,000 bytes = 74.5GB
1GB = 1024MB
1MB = 1024KB
1KB = 1024 BytesWindows xp does support hard drive bigger than 127GB. The problem you have is that your motherboard don't support hard drive bigger than 127GB, so just get a BIOS upgrade from Asus and see if that solves the problem.

ACtually, a KB is technically only 1000 bytes, NOT 1024, like everyone thinks it is. The terms are defined formally by some institute of standards (I don't remember which one). To make all the computer geeks happy, they added Gigobyte (I think that's what it was) which is the full hexadecimal to decimal number we all think Gigabyte is.

32.0 KB (32,768 bytes)
i copied the above example straight from the properties of a word document...windows is reporting that the file is 32k in size along with the byte conversion in parenthesis
32,768 ÷ 1024 = 32

I don't know why you think cutting the hard drive into half will solve the 127GB limit BIOS problem. Partition only works in windows, not in the BIOS. No matter how much you parition, you still end up with 180GB of Hard drive, and it will be displayed in the BIOS as 180GB. Since your BIOS only support upto 127GB. Therefore, you can only parition 127GB. Best thing to do, return the hard drive and get a 120GB one or upgrade your BIOS. Here is something else you can do, you might want to download the lastest Service Pack and see if that helps. I would use Windows XP SP1.

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