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Disk size limit in Windows 7?

Posted on 2010-09-18
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Windows 7 Enterprise 64-bit - what is the maximum disk size I can allocate?

Cant seem to find the table anywhere on technet..
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Question by:Gunter17
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by:dreamcomputer2000
dreamcomputer2000 earned 200 total points
ID: 33709679
I don't know if Win 7 is different but for older OSs the NTFS maximum is 256TB, any volumes larger than 2TB must be dynamic volumes. Also you must use 64kb clusters to reach that size.
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by:Gunter17
ID: 33709705
I currently have 4x 1TB drives in RAID5.
In Disk Management it is a Basic disk and is showing as 2794.41GB (2.72TB)

I did have problems in the past with volumes larger than 2TB, but only as a boot volume.
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by:Gunter17
ID: 33709709
Here's a screenshot to that effect - the C: is a separate disk.
DiskMgmt.jpg
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by:dreamcomputer2000
ID: 33709719
Due to the distributed parity in raid 5 the effective disk size is reduced by 1/4
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by:Gunter17
ID: 33709742
Well, back to the original question..

I have 5x 2TB drives on their way and I intend to use R5 with the 5 drives.
Will Windows 7 be able to see and utilize all of the 8ish TB available?
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by:dreamcomputer2000
ID: 33709767
As I understand it I would say no, but since I have limited experience with these size drives I will defer to someone with more experience. Sorry I can't be of more help.
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Lee W, MVP earned 300 total points
ID: 33709780
You should be fine, however, the disk MUST created as a GUID Partition Table (GPT) instead of MBR.  Also, unless your system supports EFI (instead of BIOS), you will not be able to install Windows to that disk; Windows will have to be installed on another drive and the RAID 5 array will have to be essentially a D: drive (or data disk).
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by:dreamcomputer2000
ID: 33709826
Thanks leew, keep posting so I keep learning! You help more than just the ones whose questions you answer.
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by:PowerEdgeTech
ID: 33709858
Only if set up one of two ways:

1) If your computer supports UEFI, then you can install on that (GPT) using your 5-disk RAID 5 of ~8TB, otherwise ...
2) You will need to set up a two-disk RAID 1 of ~2TB for Windows 7 to install and boot to/from (or a single-disk RAID 0), then a 3-disk RAID 5 of ~4GB GPT (or 4-disk RAID 5 of ~6GB).
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by:PowerEdgeTech
ID: 33709864
Sorry for the delayed echo of leew's response ... I stepped away for a few minutes to put the kids to bed, and ... bam!
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