"Used to indicate that an operation cannot continue without blocking for I/O. "

Deluge Version 1.3.9
Libtorrent Version libtorrent: 0.16.18.0
Operating System Version Windows 7 x64 Ultimate

Been getting these errors with large torrents

Used to indicate that an operation cannot continue without blocking for I/O.

Not sure if its my hard drive but getting tired of force rechecking as on large torrents it takes ages!
any help welcome