Posted 08 January 2006 - 01:44 PM
I have upgraded a slave drive from 40GB to 250GB. Copying a 1GB file to or from the 40GB drive took 66 secs. The same operation with the 250GB drive takes about ten minutes.
Does anyone have any bright ideas?
Secondary IDE channel: CD/DVD drive.
Primay IDE channel: Drive C: - a Western Dig. WD800BB ATA100, 80GB, set as master.
Drive E: - a caddy-mounted drive set as slave; was a Seagate ST340016A Ultra ATA/100 40GB
now a Seagate ST3250823A Ultra ATA/100 250GB.
With "DMA if possible" enabled on both IDE channels, copying was fast (about 60 secs) using the 40GB drive in the caddy. Inspecting the Advanced Properties of the IDE channel, it shows DMA mode 4.
With the 250GB drive in the caddy, copying in either direction takes nearly ten times as long and programmes struggle with slow access. Burning a cd is incredibly slow. In the Windows progress splash-screen, showing animated paper flying from one folder to another during a copy, the paper jerks and stops for up to a second or so, indicating interruptions (?).
After using the 250GB drive, the Advanced Properties for the primary DMA channel in Device Manager shows DMA still enabled but the actual mode is shown as PIO, which accounts for the difference in speeds almost exactly if you look up the manufacturer's listed transfer rates. The old 40GB drive stays on DMA 4.
Any ideas what might be causing the interruptions and DMA failure? Is the above configuration of devices on the IDE channels optimum?
I've contacted Seagate but they have only come up with a fix from Microsoft which MS included in Service Pack 2 anyway. I am suspicious the drive may be defective.
O/S is XP, SP2 plus subsequent relevant updates. Very many thanks if anyone can help.
P.S. Happy New Year to all!