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i have bought a 200gig hard drive and when i look at it's capacity it reads 127gb!.. shouldn't it read 200gb? can someone please help me!?

Many posts here on this subject.
Try here for a start.
http://www.computing.net/windowsxp/wwwboard/forum/122607.html

Service Pack 1 fixed that XP flaw.
How to Obtain the Latest Windows XP Service Pack
So does SP2.

You hit the 132gig ceiling; SP1 is supposed to fix it, but the reality is that sometimes it doesn't. If you are considering reinstalling XP, make youself a slipstreamed XP/SP2 disk and that will end the problems with XP seeing large drives.
Give a man a fish and you feed him for a day;
Teach a man to fish and you feed him for a lifetime;
Then industry pollutes the water and kills all the fish.

ive got service pack 2 and it dosn't fix the problem!! But can i still use the whole 200gigs or dosn't it let me?

Your hard drive does NOT need to be formatted NTFS. If your hard drive comes with a formatting program it will use fat 32 if you want.
Frozenfish did you look in computer management > disk management to see if extra space is there as unpartitioned space.
I thought I read somewhere that if you want to install XP on a hard drive bigger than 137 you have to install XP sp1 or sp2 from the get go. You can't install XP and then put the service pack on afterwards to see the extra storage. If you only have a XP disk you will have to make a slipdisk. Google for simpleslipper.

Your motherboard and BIOS must also support 48 Bit LBA mode working. Check if it does.
The 137 GB hard drive limit for FAT32 is imposed by the old ATA Protocol which has only 28 address bits to address the hard drive clusters causeing the 2^28 limit of 137 GB.
Additionally fdisk (latest version) will not allow creation of FAT32 partition sizes greater than 127 GB (problems with scandisk too in Win98). You can use WinXP to create bigger NTFS partitions. WinXP (and Win2k) only allows a maximum size of 32 GB to be created for FAT32 partitions, but will happily use greater sizes created by other tools such as fdisk and Partition Magic.
To get over the 28 bit addressing limit you need to move over to 48 bit LBA mode. This requires that the Motherboard, BIOS and OS all be 48 bit LBA compliant. WinXP SP1 and above is but not plain WinXP. Win2k SP3 and above is but not below Win2k SP2. Win98 is NOT.
Those on WinXP SP1 and above must slipstream their CD to SP1 or above (google for autostreamer) in case they need to do a re-install because re-installing with a pre SP1 CD could cause problems with such sized hard drives.
More information on my website (Homepage link).
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☺ When everything else fails, read the instructions.

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