• Do not run diagnostics programs and file system correction programs like FSCK or CHKDSK on a virtual disk until you check the operability of backup files on another partiiton. Runnig these programs implies the presence of a working data backup copy, that is why they may rewrite file marks to correct file system consistency. Anyway, if running such programs if required, they may be launched in read only mode. It will allow finding serious damages before carrying out file system restoration procedure.

Tips on how to increase chances of successful data recovery when resorting to the provider of professional services

• Do not delete files before the procedure of recovery of previously deleted files. Additionally deleted files may complicate the data recovery process.
• Do not attempt to recover data with software if you are not sure that such software will or will not record to the disk from which you intend to recover data. Some data recovery applications record to the source disk and may considerably hinder later attempts to recover data.
• If one virtual disk requires recovery but others continue operation on the same partition and cannot be closed during the recovery process, make a copy and transfer them to another partition. If a deleted virtual disk or snapshot requires recovery, better make a copy of virtual machines instead of transferring them. Therefore they won’t be recognized as deleted machines that require recovery.
• Close or move any other active virtual machine on the same volume that use snapshots. Any record to new blocks on partition may rewrite the data that require recovery.