I have also tried to look at a error code book, for the errors 577, but I cann't get anything out of that and it doesn't tell much. We have tried to run a scandisk because of the code 23: Data error (cyclic redundancy check), but no error is found. MiniTool Data Recovery: Drive doesnt show up. 23:08:25 avtar Error : Path "C:\Windows\WinSxS\amd64_microsoft-windows-network-security_31bf3856ad364e35_.17042_none_be0bf295fe635e37\nshwfp.dll": Total processed bytes 131072 is inconsistent with original data size 717312 I guess it cant read anything Macroit Disk Scanner: Drive doesnt show up. 23:08:25 avtar Error : I/O error: Unable to BackupRead(3) "C:\Windows\WinSxS\amd64_microsoft-windows-network-security_31bf3856ad364e35_.17042_none_be0bf295fe635e37\nshwfp.dll" (code 23: Data error (cyclic redundancy check)). 23:07:41 avtar Error : Path "C:\Windows\System32\nshwfp.dll": Total processed bytes 131072 is inconsistent with original data size 717312 23:07:41 avtar Error : I/O error: Unable to BackupRead(3) "C:\Windows\System32\nshwfp.dll" (code 23: Data error (cyclic redundancy check)). 23:07:25 avtar Info : Not traversing 'C:\Windows\System32\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\Content.IE5' since it's of type 'REPARSE_SYSTEM_DIR_JUNCTION' The backup is succesful, however there is some errors. At my work we are have some trouble with our EMC Avamar Backup.