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Many many thanks to both for your replies. I had to make this query before I decided to part with the DVR which obviously must have a rewind/replay fault, as both hard drives I have tried to install of compatible make, 1 x 400 gig and 1 x 500 gig were both formatted after being installed as instructed to do on monitor when installing hard drive. Neither will rewind previous recordings in order for them to be replayed. Once again many thanks for your help.

Hello to all you good forum members. I would like advice on the following problem, as I am well into my 70's and have NO cctv technical knowledge at all. Over 3 years ago, I purchased an X-Vision E4DVRCD cctv video recorder which housed an 80 gig IDE hard drive. As the hard drive had been used for over three years, I decided to replace it with a 500 gig hard drive. Both hard drives were Seagate, and both compatible with the recorder. I purchased a brand new Seagate 500 gig hard drive, and fitted it into the cctv recorder, and discarded the original 80 gig hard drive. As all the correct signs were showing on the system monitor, I thought that everything was working o.k. About 2 months after fitting the new hard drive, my neighbour had his hanging baskets stolen, and the police came and asked if they could view my cctv recordings. It was then that I realized that my cctv recorder FAILED to rewind and play what I thought would have been recorded. I have since purchased another Seagate hard drive and installed it, but still I cannot get the cctv recorder to rewind and play any recordings it may have made. As I build and repair computers as a hobby, the hard drives I have tried installing were Seagate computer hard drives, which were completely formatted, with NO data on at all, when I installed them. Should these hard drives have worked correctly, or are the hard drives for cctv recorders different from computer hard drives, or should cctv hard drives have some pre-recorded data on them to make them function correctly. All help and information on this matter, would be greatly appreciated. Many thanks to all who offer their help.