Progressively Slower file transfer after time...

[promocom]

I setup a project at my work to transfer large files (about 4gb) from a 2 tb hard drive to a 4-port USB hub. We would insert a flash drive,start the copy and then start the next and so on. At first it only took about 6 minutes total to copy the 4 flash drives. Now after about a month it is taking much longer up to 30 minutes to do the same thing.

This is happening on all 3 computers I've got setup. They all say that they are using DMA transfer and I did use HDTune and they looked all right. One big problem is I can't get Defrag to work on the big drives, same with Defraggler, they just freeze up after awhile.

This is an important project and my rep is gonna suffer if I can't figure this out... hehe So any help is much appreciated.

 

[WyomingKnott]

If I understand correctly, you are copying from the hdd to the flash. This can be affected by fragmentation but would certainly be less affected than going the other way.

The fact that defrag won't work suggests drive problems, but the odds are so highly against developing them on all three drives at the same time...

Can you run tests that separate the two elements? Test the flash devices separately on a shiny new box, do generic read/write speed testing of your HDDs and, if you are going from the HDD to the flash, see how long it takes to simply read all the blocks of the file in order? The idea here is to isolate possible causes: slow flash, slow drive, high fragmentation.

 

[promocom]

I'll try using new flashdrives to see if the problem is with them. Is noone else having problems defragging the big drives? I had one go 3 days and only do 9% using defraggler.

 

[billj214]

Sounds like a bad HDD sector, try to scan the drives with any HDD utility.
If the issue did not show itself before but did after a defrag then likely the defrag move the file onto a bad sector.

Good luck.