The answer to this relies on some further info from yourself. TV360 comes in 2 versions - a master-box with a hard drive for recording, and a mini-box that doesn't. A mini wholly relies on the master box for all recording functionality. There's pictures of the two boxes...
When you say it worked perfectly on your "other box" - what do you mean by that? Specifically, what is this "other box" - did you convert to TV360 from a combination of TiVo and/or V6? Again - photos are at https://www.virginmedia.com/care/tv-fault/which-tv-box if you want to check.
The two most common reasons for hard drive errors on a TV360 will be either a master box with a HDD fault, or a mini-box that can't access the master. There are certain settings to mitigate point 2 - but if you could confirm some of this info, that would help further advice best target your situation.
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