Win 7 Only Sees 2TB Instead of 4TB

Here's a good link you might check out.

http://support.microsoft.com/kb/2581408

VAPCMD

Tell us what the BIOS sees. Also, did you wipe the drive and try again? Some folk forget to start fresh on a HDD. Since all about partitions and more is on the web, I'll wait for you to reveal how set up the PC's HDDs.
Bob

Once you pass 3Tb of storage to include the full storage amount of all drives, you can have a problem.

!st, make darn sure the mtrbd. bios is fully updated to the latest release. Then the HDs have to be GPT'ed in order to fully use the storage available or acknowledge them. If the mtrbd. itself is older even though new it may not the " I/F guts" akin to bios to accept larger than 3Tbs or similar. You have a mtrbd. clearly state it can handle 3tb and beyond to include any RAID setup. That too maybe at fault because RAID connections may limit what it can handle if only to assured it can handle it period. You may to return the mtrbd. is not up-t-date on the newest demands out there and thus pay for a premium for a more capable one.

Last, try it only with one(1) 4Tb drive installed and see how it handles that. BUT, before doing that, be sure you have a fully updated bios and all MS updates have been gotten. Also, the HD maker may more readily answer your query if you check the Q&A or find the FAQ or review the support website of same. You know 2-$tb is NOT a typical user setup and you may have jumped the gun in making it all work. At least if it doesn't than the shop better be prepared if brought there to provide a more capable solution beyond what you already have in h/w at least. yeah, it will cost more, sorry.

tada -----Willy

is he installed the 32 bit version of Windows 7.

http://wdc.custhelp.com/app/answers/detail/a_id/2754/~/hard-drives-greater-than-2-tb-do-not-work-on-existing-operating-systems

See page 104

http://support.wdc.com/download/notes/atiwduserguide/ATIH2013WD_userguide_en-US.pdf

"Acronis Extended Capacity Manager
The Acronis Extended Capacity Manager (ECM) allows your operating system (OS) to support large capacity disks that have the MBR partition style. You are able to use the disk space beyond 2 TB. This free space will be recognized as a separate disk, and will be usable by your operating system and applications as if it was a regular physical hard disk.....How it works. Acronis Extended Capacity Manager wizard displays all hard disks larger than 2 TB (unallocated orwith MBR partition style). You can see the disk space which Windows recognizes and allocates. This space is called Windows Native Capacity in the wizard.The space beyond 2 TB is displayed as Extended Capacity. You can enable Extended Capacity Disks,and once it is done, this space becomes visible to the operating system and ready for disk management operations.How to use it. 1.To start Acronis Extended Capacity Manager....."

An alternate solution is to use a LIVE CD or DVD of some Linux distro which is free for download to setup the disc with a hybrid-like system where it reports 512kb sectors, but are actually 4096kb sized sectors and therefore can use up to 16TB size discs. Or you could use the first 2 TB of each drive for Windows and the last 2 TB of the drives for Linux.

more info
http://carltonbale.com/how-to-break-the-2tb-2-terabyte-file-system-limit/

Of course the easiest way would be to have the 64 bit version of windows 7 installed instead.

Your drive is formatted using the legacy MBR (Master Record Boot) which has a 2TB limit. To go above 2 TB you need GPT to create the partitian table.

http://en.wikipedia.org/wiki/GUID_Partition_Table

So the reason is because your motherboard is no UEFI but here is a work around. Take the 4TB hard drive(s) out and take it to another pc or hook it up externally to another pc. Re-format it as a Basic Disk>Simple Volume>NTFS. Then take the Hard drive(s) back to the computer you are wanting them in and hook them up and turn on your pc. You'll have access to a the 4TB.