Public bug reported:

Hi,

I just upgraded to feisty. After overcoming the shock of my hda having
disappeared and now being sda, I have the following issue:

UDMA 33 is used, although UDMA 100 is supported.

Here the hdparm output:

[EMAIL PROTECTED]:~$ sudo hdparm -I /dev/sda

/dev/sda:

ATA device, with non-removable media
        Model Number:       TOSHIBA MK1031GAS                       
        Serial Number:      65AQ0125S
        Firmware Revision:  AA204C  
Standards:
        Supported: 6 5 4 
        Likely used: 6
Configuration:
        Logical         max     current
        cylinders       16383   16383
        heads           16      16
        sectors/track   63      63
        --
        CHS current addressable sectors:   16514064
        LBA    user addressable sectors:  195371568
        device size with M = 1024*1024:       95396 MBytes
        device size with M = 1000*1000:      100030 MBytes (100 GB)
Capabilities:
        LBA, IORDY(can be disabled)
        Standby timer values: spec'd by Standard, no device specific minimum
        R/W multiple sector transfer: Max = 16  Current = 16
        Advanced power management level: unknown setting (0x0080)
        DMA: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4 
udma5 
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4 
             Cycle time: no flow control=120ns  IORDY flow control=120ns
Commands/features:
        Enabled Supported:
           *    SMART feature set
                Security Mode feature set
           *    Power Management feature set
           *    Write cache
           *    Look-ahead
           *    WRITE_BUFFER command
           *    READ_BUFFER command
           *    NOP cmd
           *    DOWNLOAD_MICROCODE
           *    Advanced Power Management feature set
           *    Device Configuration Overlay feature set
           *    Mandatory FLUSH_CACHE
           *    SMART error logging
           *    SMART self-test
           *    General Purpose Logging feature set
           *    IDLE_IMMEDIATE with UNLOAD
Security: 
        Master password revision code = 65534
                supported
        not     enabled
        not     locked
                frozen
        not     expired: security count
        not     supported: enhanced erase
        92min for SECURITY ERASE UNIT. 
HW reset results:
        CBLID- above Vih
        Device num = 0 determined by CSEL
Checksum: correct

and here a dmesg excerpt:

[    4.572000] ata_piix 0000:00:1f.1: version 2.10ac1
[    4.572000] ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 18 (level, low) -> 
IRQ 19
[    4.572000] PCI: Setting latency timer of device 0000:00:1f.1 to 64
[    4.572000] ata1: PATA max UDMA/100 cmd 0x000101f0 ctl 0x000103f6 bmdma 
0x00011810 irq 14
[    4.572000] ata2: PATA max UDMA/100 cmd 0x00010170 ctl 0x00010376 bmdma 
0x00011818 irq 15
[    4.572000] scsi0 : ata_piix
[    4.736000] ata1.00: ATA-6: TOSHIBA MK1031GAS, AA204C, max UDMA/100
[    4.736000] ata1.00: 195371568 sectors, multi 16: LBA 
[    4.900000] ata1.01: ATAPI, max MWDMA2
[    4.908000] ata1.00: configured for UDMA/33
[    5.072000] ata1.01: configured for MWDMA2

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

-- 
UDMA 33 instead of UDMA 100 used 
https://launchpad.net/bugs/95921

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