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DMA Disparity between Optical drives

Posted on 2008-06-20
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Last Modified: 2013-11-06
I have a Dell Dimension 8200 with 2 WD hard drives operating at UDMA 100 and a Plextor DVD-RW (2mb buffer) which is operating at UDMA-4, my 2nd Optical CD-RW drive(8mb buffer) is only operating at UDMA-2....Why??????

All cables are 80 conductor and 18" long

I used the Intel Application Accelerator program to uncover this issue. The reports show both drives with no limit on the transfer mode. Attached are the print out outs showing what is being reported:

Plextor:
Secondary Master:  PLEXTOR DVDR   PX-800A
               Model:  PLEXTOR DVDR   PX-800A
               Firmware:  1.00
               Device Type:  ATAPI - Removable - CDROM
               PIO Mode Support:  0 - 1 - 2 - 3 - 4
               DMA SW Mode Support:  No Support
               DMA MW Mode Support:  0 - 1 - 2
               UDMA Mode Support:  0 - 1 - 2 - 3 - 4
               Default Transfer Mode:  UDMA-4
               Current Transfer Mode:  UDMA-4
               Transfer Mode Limit:  No Limit
               Cable Type (Device):  80 Conductor
               Cable Type (Host):  80 Conductor
               PIO PPE:  Enabled
               UDMA Control Register:  Ultra DMA Mode Enabled
               UDMA Timing Register:  CT = 2 CLK / RP = 8 CLK
               Base Clock:  Ultra DMA 66 Timings
               Auto-Acoustic Management:  Feature not supported by device.
               Advanced Power Management:  Feature not supported by device.

HL-DT-ST

Secondary Slave:  HL-DT-ST GCE-8400B
               Model:  HL-DT-ST GCE-8400B
               Firmware:  C104
               Device Type:  ATAPI - Removable - CDROM
               PIO Mode Support:  0 - 1 - 2 - 3 - 4
               DMA SW Mode Support:  No Support
               DMA MW Mode Support:  0 - 1 - 2
               UDMA Mode Support:  0 - 1 - 2
               Default Transfer Mode:  UDMA-2
               Current Transfer Mode:  UDMA-2
               Transfer Mode Limit:  No Limit
               Cable Type (Device):  80 Conductor
               Cable Type (Host):  80 Conductor
               PIO PPE:  Enabled
               UDMA Control Register:  Ultra DMA Mode Enabled
               UDMA Timing Register:  CT = 2 CLK / RP = 4 CLK
               Base Clock:  Ultra DMA 33 Timings
               Auto-Acoustic Management:  Feature not supported by device.
               Advanced Power Management:  Feature not supported by device.

Can this CD-RW be improved to UDMA-4? Is the drive limited to UDMA-2 due to its age? Everything else appears to be operating properly.
 
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Question by:ginovino
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by:garycase
ID: 21832859
That's normal ... it's simply as fast as that model drive supports.   As long as it's running in DMA mode all is fine => the only thing you need to watch for with optical drives is that they don't revert to PIO mode.
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by:ginovino
ID: 21833132
Then simply put, the CD-rw could never perform at UDMA-4. Its max speed is only UDMA-2 (16mhz ?).
Its a wonderful drive with a built-in 8mb buffer!.. I'd be hard pressed to find one as good. Suggestions?
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garycase earned 250 total points
ID: 21833230
UDMA-2 is 33MB/s ... which is still much faster than the sustained transfer rate of the drive ==> there would be NO difference in the performance of the drive with a faster interface :-)   [technically the PC <-> buffer transfers would be a bit faster, but these are a VERY small % of the transfers]

... Nothing to suggest => the drive is working just fine !!
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