I have a Western Digital 1TB hard disk, formatted in one WFBS and one NTFS partition. My hard disk works just fine, except for when i try to get my backups on the WFBS partition: When i'm using my backup manager, after some time, mostly around 10 minutes, the backup manager gives an error message. I cannot access the partitions anymore because of an i/o device error. I can only access it again if i first plug the power of the disk out. Around 10% of the time that i plug in my hard disk, it doesn't give this error. Because of this it takes very long to get my backups on the hard disk, and often the iso gets corrupted in the process, so i really want to get rid of this error. I have tried lots of software things, such as reformatting my NTFS drive and keeping the drive active manually, but so far nothing has worked. Any ideas? Thanks in regards.