JMecc

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Is it partitioned perhaps? Some areas unformatted?
Right-click on 'My Computer' and hit manage
There, the Disk Management should show the partitions.
You can also pick Device Manager > Disk drives & double click on the drive in question. Under the volumes tab, hit populate and this should show all volumes on this physical drive.
Jo
 

Dragonking666

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to answer the first guys question, yes. I deleted the partition and now it doesnt show up in windows at all, and theres nothing for me to click on to to make a new partition. I do have SP2 my specs are : AMD 4800+X2 7900gt 2 gigs of corsair xms ram pc4000 and i have a 160 gig seagate SATA 3.0 and the new hard drive is a seagate 250 gig SATA 3.0, Mobo is DFI lanparty ultra NForce 4.
 

Dragonking666

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To answer the first guys question, yes. I deleted the partition and now it doesnt show up in windows at all, and theres nothing for me to click on to to make a new partition. I do have SP2 my specs are : AMD 4800+X2, 7900gt, 2 gigs of corsair XMS ram pc4000 and I have a 160 gig seagate SATA 3.0 and the new hard drive is a seagate 250 gig SATA 3.0, Mobo is DFI lanparty ultra NForce 4.
 
Get a Linux LiveCD such as Knoppix and use Qtparted to create a NTFS partition that takes up the whole drive, then reboot in Windows; it should force Large LBA support and you should then be able to fill it with any junk you want.

Qtparted is also able to see if your Master Boot Record got corrupted (thus confusing Windows) for any reason, and offer you to rewrite it (in Windows, you need to use command-line FDISK from a floppy to get it to work).
 

Fatn3rd

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have you recently changed the jumper settings on the HDD? some HDD"s have a size limiting feature to remain compatable with older OS/hardware

the pins are found next to the master/slave/cs pins
 

mkaibear

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It'll either be that you've set the clip jumpers to clip the space (these are near the master/slave jumpers), or your BIOS doesn't like disks of over a certain size.
 

Dragonking666

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the jumper only controls the speed from being limited at 1.5 when you take it out. its at the 3.0 speed. thats what it says on the hard drives.