vmware virtual machine corrupted when booting

I  have 3 virtual machines (win 2008) running on VMware server.
Last week the server crashed, and on the console window of one the virtual machines, I get a windows error 'bad or missing c:\windowssystems32 ..ntfs.sys is missing,  please insert ...' Result : all data for the 3 virtual machines was lost, and I had to rebuild the VMware and esx from scratch. Cab anybody explain me what could have caused the problem . I did not have a power failure
MolenBelgiumAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Were any snapshots attached?

what failed?

seems possible the VMDKs and/or datastore was affected.
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dipopoCommented:
Yes it seems you had a corruption on the vmdk files, would have been interesting if you tried to recover the Windows OS via the recovery console.

Also you can configure mini-dumps or full dumps if this has occurred before, should create a crash dump with the issue logged.
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MolenBelgiumAuthor Commented:
I this a common problem, or rather exeptional
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dipopoCommented:
I'd say exceptional not had a ESX(i) host crash but once and that was due to an APD issue.
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compdigit44Commented:
Does your host use local or remote storage? Did you run a diag on the server to check for hardware errors? Did you review your host logs?
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