We installed XP Pro on a new Seagate 640 GB Sata drive and we are limited to 137 GB.  How can we get the full drive recognized wo/ a new reinstall of XP Pro.  After the install we installed SP2.well you can go to start>right click on my computer>manage>storage>disk managment and you can take the unollocated space and maeke a new partition Excuse my failure to mention in the opening that we would rather not partition.  We're looking for one partition of 640 GB. http://www.techspot.com/vb/topic36678.html
I have an original XP Pro installation wo/ SP1 on a 640 GB Seagate Sata Drive. Can I use Partition Manager to create one partition. Is there a limit to the size of a partition using Partition Manager? Or would I have to make one very large partition and one smaller partition? I am trying to avoid reformatting the hard drive and creating a slipstream XP installation disc. This is not a BIOS problem, it's an XP Pro early edition problem.Here you go....

http://www.seagate.com/ww/v/index.jsp?vgnextoid=c9fec8fcbe4c9110VgnVCM100000f5ee0a0aRCRD&locale=en-US

go to the downloads and get the software. It will let your machine see the whole drive.

is that not a Drive-overlay program? Will those work after windows is installed?I assume you are talking about Seatools for DOS or would I be able to RECOGNIZE the whole drive using Seatools for Windows?I think SeaTools is a Drive Overlay program- those are really only useful when the BIOS cannot recognize the correct size- but that is not the case. As you said you don't want to have to reinstall from a slipstreamed XP- so the solution involves finding a partition tool that can resize partitions without destroying their contents. Acronis TrueImage,Partition Magic, and numerous other programs can perform this task- I don't know of any free ones, however...Your Drive Controller is only 28-bit, and needs to be replaced with 48-bit controller. I'd buy a cheap PCI drive controller that will give you 48-bits of data addressing of the drive to unlock the full potential of your drive.His problem is with the Initial Release of XP's problem with drives larger then 137... It's the generic IDE disk driver provided in the original release.

It was (I presume) installed using a XP (no SERVICE pack) CD, and subsequently UPDATED. They can access the rest of the disk now, but they want it all in one partition- thus my suggestion for a partition resizer.I do know of a free partition manager w/ good reviews.........from EASEUS......called Partition Manager Free Home Edition.....said to be pretty safe from data loss.STOP! 

tThe post by BC_Programmer IS RIGHT ON!
For the right answer you have to read the whole thing on the Seagate site. It is a Microsoft Boo Boo in the XP and even sp1. It was FIXED in XP sp2, but not in sp2 on top of sp1 unless you read everything. Ad do what it says.
Failure to pay attention to this detail can destroy the whole SYSTEM!
Read this: http://www.48bitlba.com/ 

So you want to sell a product to solve this ? ?
Are you aware all the ads there are for paid for programs when free alternatives are out there ? ?Here's a thought.....if one were to slipstream service packs with the original XP OS, would a repair install possibly allow one recognize the whole hard drive as one partition?