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Thread: Note on Windows XP and UDMA devices at different Speeds

  1. #1
    Forum Techie terrancelam's Avatar
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    Note on Windows XP and UDMA devices at different Speeds

    this is really wierd, either XP is lying and misreading the UDMA drive or they finally incorporated the IDE tweaking capabilities and worked around the CD-RW problem!

    For those of you who are confused, I'm running a CD-RW drive on PIO-4 and a DVD drive at UDMA 66 on the same channel! Not only is it recognized in the bios at working at these speeds, but also in Windows XP!

    Now this may be a motherboard specific thing, but I think it might be that XP has solved this issue?
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  2. #2
    Certified SG Addict Brent's Avatar
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    how do you know it's working at those speeds

    have you benchmarked the drives?

    the DVD drive can only burst at the top speed it can rip at, i.e if it's 16X or something it's only at MOST 12MB/sec so there is no use for UDMA/66 on a drives like that, heh
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  3. #3
    Forum Techie terrancelam's Avatar
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    Well this is the thing

    I found out from Round eye that my DVD doesn't really work at UDMA 66, it just says that so it can be attached to a HD on the same channel and not lose much speed.

    But from what I understand of Windows as an OS, it should report the drives to be working at the lowest speed of the two devices, shouldn't it?

    As for benchmarking, I'll do some benchs tonight and see where this takes me.
    Intel Core 2 Duo Q8300 2.55Ghz (1333mhz)
    Asus P5N-D
    OCZ Platinum 8gb (2x2gb) PC8000 1000mhz 5-5-5-18
    EVGA 460GTX 1gb PCIE 2.0
    Western Digital Black 640gb x 2 Raid 0
    Coolermaster 1000W Modular PSU
    Antec NSK4480B
    Windows 7 Professional 64-bit

    ----------------------------------------------------------
    HP TC5700 (Thin Client) 1ghz, 512mb 80gb 1x1000mb NIC 1x100mb NIC running PFSense 1.22
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    "SG Techies rule!" - Sig Buddies with Amro

  4. #4
    Certified SG Addict Brent's Avatar
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    Re: Well this is the thing

    Originally posted by terrancelam
    I found out from Round eye that my DVD doesn't really work at UDMA 66, it just says that so it can be attached to a HD on the same channel and not lose much speed.

    But from what I understand of Windows as an OS, it should report the drives to be working at the lowest speed of the two devices, shouldn't it?

    As for benchmarking, I'll do some benchs tonight and see where this takes me.
    no, in windows it will report whatever speed it's connected at

    theoretically it's connected at that speed, but in reality it won't transfer that fast due to your other drive being slower on the cable, it's a physical thing that the OS can't detect....
    "Would you mind not standing on my chest, my hats on fire." - The Doctor

  5. #5
    Forum Techie terrancelam's Avatar
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    O.k

    theoretically it's connected at that speed, but in reality it won't transfer that fast due to your other drive being slower on the cable, it's a physical thing that the OS can't detect....

    Not understanding here brent, If the drive is connect at UDMA 66, and it probably won't transfer any faster then 12mb per sec, how is the CD-RW at pio mode 4 going to slow it down? (BTW I did attach a ATA 100 cable 80wire, 40 connector for the two drives).
    Intel Core 2 Duo Q8300 2.55Ghz (1333mhz)
    Asus P5N-D
    OCZ Platinum 8gb (2x2gb) PC8000 1000mhz 5-5-5-18
    EVGA 460GTX 1gb PCIE 2.0
    Western Digital Black 640gb x 2 Raid 0
    Coolermaster 1000W Modular PSU
    Antec NSK4480B
    Windows 7 Professional 64-bit

    ----------------------------------------------------------
    HP TC5700 (Thin Client) 1ghz, 512mb 80gb 1x1000mb NIC 1x100mb NIC running PFSense 1.22
    Linksys WRT-150 running DD-WRT V.24 (Access Point)

    "SG Techies rule!" - Sig Buddies with Amro

  6. #6
    Forum Techie terrancelam's Avatar
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    hmmmm

    wierdness...
    The DVD Drive reading a CD


    The DVD Drive reading a DVD


    The CD-RW Drive reading a CD


    I can see that I'm loosing a bit of my cd read compared to Roundeyes, see the DMA 66 post for more details, but other then that...not much really lost.
    Intel Core 2 Duo Q8300 2.55Ghz (1333mhz)
    Asus P5N-D
    OCZ Platinum 8gb (2x2gb) PC8000 1000mhz 5-5-5-18
    EVGA 460GTX 1gb PCIE 2.0
    Western Digital Black 640gb x 2 Raid 0
    Coolermaster 1000W Modular PSU
    Antec NSK4480B
    Windows 7 Professional 64-bit

    ----------------------------------------------------------
    HP TC5700 (Thin Client) 1ghz, 512mb 80gb 1x1000mb NIC 1x100mb NIC running PFSense 1.22
    Linksys WRT-150 running DD-WRT V.24 (Access Point)

    "SG Techies rule!" - Sig Buddies with Amro

  7. #7
    R.I.P. 2018-07-16 RoundEye's Avatar
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    Cool

    terrance, see your other thread.
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  8. #8
    Forum Techie terrancelam's Avatar
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    will do

    will post some more benchmarks after, tire like heck...was playing football for some excersize, 2 hours..ahh
    Intel Core 2 Duo Q8300 2.55Ghz (1333mhz)
    Asus P5N-D
    OCZ Platinum 8gb (2x2gb) PC8000 1000mhz 5-5-5-18
    EVGA 460GTX 1gb PCIE 2.0
    Western Digital Black 640gb x 2 Raid 0
    Coolermaster 1000W Modular PSU
    Antec NSK4480B
    Windows 7 Professional 64-bit

    ----------------------------------------------------------
    HP TC5700 (Thin Client) 1ghz, 512mb 80gb 1x1000mb NIC 1x100mb NIC running PFSense 1.22
    Linksys WRT-150 running DD-WRT V.24 (Access Point)

    "SG Techies rule!" - Sig Buddies with Amro

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