mikesan

Thanks for your reply. To expand: I too have another external USB drive on which defragger works fine. However on the Samsung 1.5TB drive it simply fails. By logical drives I mean the partitions on the single drive, each with its own drive letter. The drive shows up perfectly in Disk Management. So, the question is: are there some usb drives which fail to work with defragger?

Nobody home? Am I the only one to experience failure of Defrag on an external usb drive?

Defragger works just great on my installed hard disks. However when I attempt to use it on one of my external usb drives (1.5TB Samsung) the analysis reports "failed" on each of the logical drives. Running Win7x64 on Intel CPU. Latest version of Defragger installed. Can you help. Thanks