UDMA 33 instead of UDMA 100 used

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:

konradsa@ubuntu:~$ 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