have a look at the discs from the windows 7 machine by running "diskmgmt.msc" What is the total size of the disk? and how many partitions in total?MCITP: Enterprise Administrator Windows Server 2008 MCTS: Windows 7, Active Directory, Network Infrastructure, Applications Infrastructure, Exchange 2007 ITIL V3 Certified

please check the link below and see if that might be the problem http://www.sevenforums.com/performance-maintenance/71092-space-disappearing-data-partition.html "Open an elevated Command Prompt and type vssadmin list shadowstorage. Then look for the data partition letter and see whether it shows your missing space in allocated. This would be the amount that system restore has grabbed up to now. Maximum would be what it will grab ultimately before reusing the space. "

have a look at the discs from the windows 7 machine by running "diskmgmt.msc" What is the total size of the disk? and how many partitions in total? The bottom part shows all the allocations correct, but the top part shows everything wrong. The problems happen on two hard disks of the same computer.

All the Shadow Copy Storage Volume, used and allocated are zero. vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool (C) Copyright 2001-2005 Microsoft Corp. Shadow Copy Storage association For volume: (D:)\\?\Volume{933aa993-c93d-11df-a687-806e6f6e6963}\ Shadow Copy Storage volume: (D:)\\?\Volume{933aa993-c93d-11df-a687-806e6f6e6963}\ Used Shadow Copy Storage space: 0 B (0%) Allocated Shadow Copy Storage space: 0 B (0%) Maximum Shadow Copy Storage space: 2.93 GB (10%) Shadow Copy Storage association For volume: (E:)\\?\Volume{933aa995-c93d-11df-a687-806e6f6e6963}\ Shadow Copy Storage volume: (E:)\\?\Volume{933aa995-c93d-11df-a687-806e6f6e6963}\ Used Shadow Copy Storage space: 0 B (0%) Allocated Shadow Copy Storage space: 0 B (0%) Maximum Shadow Copy Storage space: 3.223 GB (10%) Shadow Copy Storage association For volume: (F:)\\?\Volume{933aa996-c93d-11df-a687-806e6f6e6963}\ Shadow Copy Storage volume: (F:)\\?\Volume{933aa996-c93d-11df-a687-806e6f6e6963}\ Used Shadow Copy Storage space: 0 B (0%) Allocated Shadow Copy Storage space: 0 B (0%) Maximum Shadow Copy Storage space: 6.055 GB (10%) Shadow Copy Storage association For volume: (G:)\\?\Volume{08743fb1-cc52-11df-aa56-806e6f6e6963}\ Shadow Copy Storage volume: (G:)\\?\Volume{08743fb1-cc52-11df-aa56-806e6f6e6963}\ Used Shadow Copy Storage space: 0 B (0%) Allocated Shadow Copy Storage space: 0 B (0%) Maximum Shadow Copy Storage space: 3.223 GB (10%) Shadow Copy Storage association For volume: (C:)\\?\Volume{933aa998-c93d-11df-a687-806e6f6e6963}\ Shadow Copy Storage volume: (C:)\\?\Volume{933aa998-c93d-11df-a687-806e6f6e6963}\ Used Shadow Copy Storage space: 0 B (0%) Allocated Shadow Copy Storage space: 0 B (0%) Maximum Shadow Copy Storage space: 7.812 GB (10%) Shadow Copy Storage association For volume: (L:)\\?\Volume{1ebb2a0b-cb8e-11df-8f42-806e6f6e6963}\ Shadow Copy Storage volume: (L:)\\?\Volume{1ebb2a0b-cb8e-11df-8f42-806e6f6e6963}\ Used Shadow Copy Storage space: 0 B (0%) Allocated Shadow Copy Storage space: 0 B (0%) Maximum Shadow Copy Storage space: 5.859 GB (10%) Shadow Copy Storage association For volume: (K:)\\?\Volume{1ebb2a0c-cb8e-11df-8f42-806e6f6e6963}\ Shadow Copy Storage volume: (K:)\\?\Volume{1ebb2a0c-cb8e-11df-8f42-806e6f6e6963}\ Used Shadow Copy Storage space: 0 B (0%) Allocated Shadow Copy Storage space: 0 B (0%) Maximum Shadow Copy Storage space: 3.906 GB (10%) Shadow Copy Storage association For volume: (J:)\\?\Volume{1ebb2a0d-cb8e-11df-8f42-806e6f6e6963}\ Shadow Copy Storage volume: (J:)\\?\Volume{1ebb2a0d-cb8e-11df-8f42-806e6f6e6963}\ Used Shadow Copy Storage space: 0 B (0%) Allocated Shadow Copy Storage space: 0 B (0%) Maximum Shadow Copy Storage space: 3.906 GB (10%) Shadow Copy Storage association For volume: (M:)\\?\Volume{e37009a4-7d0d-11e0-998a-806e6f6e6963}\ Shadow Copy Storage volume: (M:)\\?\Volume{e37009a4-7d0d-11e0-998a-806e6f6e6963}\ Used Shadow Copy Storage space: 0 B (0%) Allocated Shadow Copy Storage space: 0 B (0%) Maximum Shadow Copy Storage space: 9.756 GB (10%) Shadow Copy Storage association For volume: (H:)\\?\Volume{933aa994-c93d-11df-a687-806e6f6e6963}\ Shadow Copy Storage volume: (H:)\\?\Volume{933aa994-c93d-11df-a687-806e6f6e6963}\ Used Shadow Copy Storage space: 0 B (0%) Allocated Shadow Copy Storage space: 0 B (0%) Maximum Shadow Copy Storage space: 4.883 GB (10%)

View from Windows 2003

I have a test computer consists of multiple partitions with size from 30G to 100G installed with Windows 7, Vista, Server 2003, and Server 2008 separately as well as two data partitions. All of a sudden all the partitions shrunk to 500M when viewed from Windows 7, Vista or Server 2008. However when viewed from Server 2003, they are all right. The server 2003 is the first partition on the hard disk. I suppose there is something wrong with the partition table. Then somehow booting into Server 2003, all partition shows correct sizes. I wonder!