My 1tb small external hard drive is not picking up in My Computer but it is picking up in Device Management and Disc Management although it shows 876gb unallocated, the HD reads fine on a different computer and our TV, a large 1tb external hard drive picks up perfectly fine on my computer (using the same casing as with the small hard drive) the HD in question worked on my computer until I re-installed windows yesterday. I have tried a lot of solutions, but to no avail, please help. TIA