I believe that the EISA partition is used for diagnostics and system restoring. I'm not sure what your unknown partition is, but it may just be unused space.
Yes, it should wipe the hard drive and return the system to it's factory condition.
The Dell System Restore by Symantec can be used for as many times as you like, providing the hard drive has not failed or the DSR has not been made unusable, see the following,
shesagordie
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October 17th, 2006 17:00
DoubleDaffy
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October 17th, 2006 17:00
bigten333
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October 17th, 2006 19:00
Message Edited by bigten333 on 10-17-2006 03:48 PM
shesagordie
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October 17th, 2006 20:00