I have a external hard drive that has data on it but has now become unallocated

[magicmanuk]

Hello,
i have a external hard drive that windows detected and allocated a drive letter it has over 400gig of data on it but has now become unallocated how do i allocate it without loseing data

 

[szaboaz]

Hi, check out this thread with similar problem and some answers:
http://www.tomshardware.co.uk/forum/280136-14-hard-drive-switches-read-data#t1904697