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My new i7 computer cannot detect a newly installed 3TB hard disk as 3TB but rather reads it as 700GB. My motherboard model is Intel DH67BL. I have windows 7 64 bit. I have enabled UEFI in the BIOS. I have initialized it as GPT. What am I doing wrong here. I was told that my motherboard supports 3TB hard disks

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You will need to be more specific. Exactly where do you see 700GB? – psusi Jul 21 '12 at 22:24
after i initialize the disk without formatting the drive, it shows unallocated 700 gb. Also i tried formatting it and its creates a single partition of 700 gb – Megan Jul 22 '12 at 12:46
Be careful which SATA port you are using. If it is on the eSATA compatible port, switch to another one. Also, update/install the Intel chipset drivers. – Bora Jul 22 '12 at 22:43
@Bora i have put the hard disk on sata 6gbps slot – Megan Jul 23 '12 at 13:55
What about the Intel Chipset Drivers? Also, please provide a screenshot of your Disk Manager (see @psusi s comment) – Bora Jul 23 '12 at 15:28
up vote 1 down vote accepted

Either your disk driver or disk controller can not handle > 32 bit addressing. Since this is Windows 7, its AHCI driver should be able to handle this. Go into your bios and make sure the controller is in ACHI mode, not IDE mode. It should work either way, but my guess is that it's in IDE mode and the Windows IDE driver has a bug that prevents it from addressing > 32 bits.

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its in achi mode – Megan Jul 23 '12 at 13:54
@Megan, which disk driver are you using? – psusi Jul 23 '12 at 17:36
what disk driver? please enlighten me . . i have no clue about this . . and btw my hdd didnt come with a HBA card – Megan Jul 23 '12 at 18:13
@Megan, open the device manager, view devices by connection, and drill down until you find the disk drive. Then look up one level at the controller it is connected to, open the properties on it, and look at the driver tab. – psusi Jul 23 '12 at 18:22

Check the disk format. NTFS, Fat32, etc..

The best solution is format your disk to NTFS and split the disk to 2 partitions.

In this article you can read the file systems limitations: NTFS compared to FAT and FAT32

NTFS has always been a more powerful file system than FAT and FAT32. Windows 2000, Windows XP, and the Windows Server 2003 family include a new version of NTFS, with support for a variety of features including Active Directory, which is needed for domains, user accounts, and other important security features. For more details about features in NTFS, see NTFS.

FAT and FAT32 are similar to each other, except that FAT32 is designed for larger disks than FAT. The file system that works most easily with large disks is NTFS.

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