We have 6 Windows 2003 Standard R2 with SP2 and Citrix Presentation 4.5 servers in a farm. Some Citrix servers have at random intervals some problems with the imaging of the disks (full or incremental). An example of the most recent log is shown below: The rights for the account which we use to make the image have enough priveleges to perform this task. The disks have no bad sectors and usualy images fine the next day or so. Supposedly there is an application which locks the drive (reading other threads), but I can not figure out which one it is. Maybe McAfee VSE8.5i with Patch 4 could be a problem, so to be sure is there an article about which processes and / or files and folders to exclude. We have many more servers in the same configuration (although not with Citrix) which do no have a problem. Any suggestions are very welcome, because we are puzzled by this issue. Note: It's realy random. Sometimes it is server 1+2 and the next day 4+6 or an other combination of servers. There's no pattern to be seen in this. There are no events in the Windows Eventlog which could point us in any direction... Version of Acronis is: TrueImage Server version 9.1 (build 3,920).