Since reflash HDD not working

It was all great until I had to reflash lastnight. Tried everything but it seems locked.

I have tried to initialise the HDD, Unmount it (after disabling timeshift) and format it. But it won't as it says it's inuse.

It was all working fine before I had to flash and load everything again. I did have a problem where my laptop switched off while I was shifting some images to the HDD via filezilla halfway through and not sure if that has locked it and everything thinks it's still in use? I have tried switching off HDD, Laptop and Zgemma box.

I am using a seagate 500gb HDD, external plugged in the front.

Im using OpenATV on the slyskin.

Any help would be appreciated. Thanks in advance.

Thanks for the replies. Really weird. I switched the box off overnight. Came to do all this today but it seems to have clicked in and is working again. My line has switched off though, so off to try and sort that now! lol

Cheers chaps