I am having problems starting Windows, but in a diagnostic test got the following errors. Does anyone know what they mean?

Error Code 0146
Msg: Error Code 2000-0146
Msg: Hard Drive 1 - Self Test log contains previous error(s). The given error code and message can be used by Dell Technical Support to help diagnose the problem.

Error Code 0F00:056D
Msg: DISK_0 - The self-test failed the read portion of the test.
 
Error Code 0F00:0240
Msg: DISK_0 - Block 27709201: Address mark not found or media error
 
Error Code 0F00:0240
Msg: DISK_0 - Block 27709202: Address mark not found or media error
 
Error Code 0F00:1A40
Msg: DISK_0 - Block 27709201: Address mark not found or media error
 
Error Code 0F00:1A44
Msg: DISK_0 - Block 27709202: Uncorrectable data error or media is write protected

Thanks

Graham