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sdelete: cleaning free disk space after delete

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michdai View Drop Down
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    Posted: 27 November 2012 at 9:42am
I got a problem when using sdelete  to delete file which is encrypted by EFS

My command is like  sdelete C:\somefile.txt

After Console output the successfully info

C:\somefile.txt…deleted.

It start output

Cleaning free space to securely delete compressed files: 0%

This confuses me a lot, I did not use –c param why sdelete start clean the free space on my desk

Based on the info from http://technet.microsoft.com/en-us/sysinternals/bb897443.aspx , it makes sense that sdelete a file in EFS protection requires additional cost to invoke the defragmentation API to find the clusters on a disk which is used by the file, but it should not clean all the disk.

The only answer I can figure out is that the sdelete need to clean all the free disk space to make sure the backup file (EFS will create a plain text back up file during encrypting a existing file to encrypted, ref ) will be wiped out

So if this is the case, my question is
if I'm sure the file is created directly in the existing file(no backup file will be created), can I skip the clean disk space operation manually?
And if this is not the case, my question is
why sdelete need to wipe out all the free disk space?
 
My OS Version is Windows Server 2008 R2 Enterprise
Thank you very much in advance
 
Best Regards
 
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michdai View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote michdai Quote  Post ReplyReply Direct Link To This Post Posted: 04 December 2012 at 1:14am
Anyone got anyidea
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