Re: Serial ATA and UDMA

From: Edward (edward_at_tripled.iinet.net.au)
Date: 06/30/04

  • Next message: Andrew Scott: "copying large files between filesystems" 
    Date: Wed, 30 Jun 2004 09:37:09 +0800
To: For users of Fedora Core releases <fedora-list@redhat.com>

    Jonathan Rawle wrote:

    > I happened to be looking in dmesg and noticed the following:
    >
    > SCSI subsystem initialized
    > libata version 1.02 loaded.
    > ata_piix version 1.02
    > PCI: Setting latency timer of device 0000:00:1f.2 to 64
    > ata1: SATA max UDMA/133 cmd 0xC000 ctl 0xC402 bmdma 0xD000 irq 177
    > ata2: SATA max UDMA/133 cmd 0xC800 ctl 0xCC02 bmdma 0xD008 irq 177
    > ata1: dev 0 cfg 49:2f00 82:346b 83:7f01 84:4003 85:3c68 86:3e01 87:4003
    > 88:20ff
    > ata1: dev 0 ATA, max UDMA7, 234493056 sectors: lba48
    > ata1: dev 0 configured for UDMA/133
    >
    >
    > Does this mean that my SATA hard drive is operating at UDMA/133 rather than
    > 150? Some sources say that UDMA7=UDMA/133, but some mention UDMA/150. Is
    > there such thing as UDMA/150, or is UDMA7 one step up from UDMA/133?
    >
    > Could this an issue of my SATA interface not being completely supported?
    > It's the onboard controller on an 865PE motherboard.

    Jonathan, I'm not sure about the controller itself, but don't forget a
    lot of hard drives are still not really native UDMA/150. A lot are still
    parallel hard disk drive interfaces 'converted' to a SATA interface.
    PATA is currently at a limit of UDMA/133, so that may be what you're seeing?

    Regards,
    Ed. 

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