[RESOLVED] DVD Drives (SATA)

[Falcon Speed]

I have two SATA DVD Drives. When I copy data from each drive, one at a time, it takes about 5 minutes for 4gb. It is normal.

However, when I use both DVD Drives simultaneously at the same time, then the process seems to take forever, like 20 minutes. Simple question: Why?

[Midknyte]

If you mean you are burning to 2 drives at one time, you are creating read contention on the source drive. That will add overhead to both processes.

[Falcon Speed]

Hi Midknyte,

Actually, burning/writing simultaneously works fine. I use PowerISO.

It bottle necks when copying/reading data from both DVD Drives at the same time.

BTW... Do you share a cell with the Joker at Arkham Asylum?

[Midknyte]

It bottle necks when copying/reading data from both DVD Drives at the same time.

So you're coping data from both drives to the hard drive? Now you're creating write contention. The hard drive has to split time between both drives, which slows everybody down.

Nope. We all get our own cells. He would probably bug me anyway.

[Falcon Speed]

So you're coping data from both drives to the hard drive? Now you're creating write contention. The hard drive has to split time between both drives, which slows everybody down.

Write Contention! Yes, that is the right phase to describe this Midknyte. So, no way around this? Not a big deal but just wondering from a performance point of view.

[Midknyte]

Not really. You're reading from two sources and writing to a single source.

You can see if you can enable NCQ on the drive, but I'm not sure how effective it would be.
https://en.wikipedia.org/wiki/Native_Command_Queuing

[Train]

Actually read the disks is the slowest part. And the controller is using times out to switch back and forth between them 2 solw things is causing the slowdown.

[Falcon Speed]

Ok, thanks for the information and confirmation. It is what it is.