eSATA drive won't mount. Wrong data rate ?

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Some of this was previously discussed in the "External eSATA drive
doesn't fdisk properly ? F8 eSATA hotplug ?" thread.

Computer: HP hdx9494.  T8100 processor, 4 GB RAM, running 32 bit Fedora
8.

Drive: Azio SATA/USB enclosure, Hitachi 500GB 3.5" hard drive.   The
drive works excellent under USB access. 

$ uname -a
Linux localhost.localdomain 2.6.26.5-28.fc8 #1 SMP Sat Sep 20 09:32:58
EDT 2008 i686 i686 i386 GNU/Linux

If I shut the machine off, power up the external drive and then boot the
computer, I get the following in /var/logs/messages:

Oct  2 11:10:37 localhost kernel:  sdb: sdb1
Oct  2 11:10:37 localhost kernel: sd 2:0:0:0: [sdb] Attached SCSI disk
Oct  2 11:10:37 localhost kernel: ACPI: PCI Interrupt 0000:20:00.0[A] ->
GSI 19 (level, low) -> IRQ 19
Oct  2 11:10:37 localhost kernel: scsi3 : sata_sil24
Oct  2 11:10:37 localhost kernel: ata4: SATA max UDMA/100 host
m128@0xe0100000 port 0xe0102000 irq 19
Oct  2 11:10:37 localhost kernel: ata4: SATA link up 1.5 Gbps (SStatus
113 SControl 0)
Oct  2 11:10:37 localhost kernel: ata4.00: ATA-8: Hitachi
HDP725050GLA360, GM4OA52A, max UDMA/133
Oct  2 11:10:37 localhost kernel: ata4.00: 976773168 sectors, multi 0:
LBA48 NCQ (depth 31/32)
Oct  2 11:10:37 localhost kernel: ata4.00: configured for UDMA/100
Oct  2 11:10:37 localhost kernel: scsi 3:0:0:0: Direct-Access     ATA
Hitachi HDP72505 GM4O PQ: 0 ANSI: 5
Oct  2 11:10:37 localhost kernel: sd 3:0:0:0: [sdc] 976773168 512-byte
hardware sectors (500108 MB)
Oct  2 11:10:37 localhost kernel: sd 3:0:0:0: [sdc] Write Protect is off
Oct  2 11:10:37 localhost kernel: sd 3:0:0:0: [sdc] Write cache:
enabled, read cache: enabled, doesn't support DPO or FUA
Oct  2 11:10:37 localhost kernel: sd 3:0:0:0: [sdc] 976773168 512-byte
hardware sectors (500108 MB)
Oct  2 11:10:37 localhost kernel: sd 3:0:0:0: [sdc] Write Protect is off
Oct  2 11:10:37 localhost kernel: sd 3:0:0:0: [sdc] Write cache:
enabled, read cache: enabled, doesn't support DPO or FUA
Oct  2 11:10:37 localhost kernel:  sdc: sdc1
Oct  2 11:10:37 localhost kernel: sd 3:0:0:0: [sdc] Attached SCSI disk
Oct  2 11:10:37 localhost kernel: ACPI: PCI Interrupt 0000:00:1f.1[A] ->
GSI 16 (level, low) -> IRQ 16
Oct  2 11:10:37 localhost kernel: scsi4 : ata_piix
Oct  2 11:10:37 localhost kernel: scsi5 : ata_piix
Oct  2 11:10:37 localhost kernel: ata5: PATA max UDMA/100 cmd 0x1f0 ctl
0x3f6 bmdma 0x70a0 irq 14
Oct  2 11:10:37 localhost kernel: ata6: PATA max UDMA/100 cmd 0x170 ctl
0x376 bmdma 0x70a8 irq 15
Oct  2 11:10:37 localhost kernel: ata5.00: ATAPI: Optiarc BD ROM
BC-5500A, 1.86, max MWDMA2

If I run hwbrowser and look at it, it shows the drive under sdc with the
correct geometry and such, but without a partition, ie no sdc1 or file
sizes.

So it appears to be recognized by the computer on some level.

However, if I mount it with "mount /dev/sdc1 temp" or "mount
-text3 /dev/sdc1 temp", the console will hang for a minute or so before
returning without any errors.  However, the drive is unusable (ls
returns an empty directory) and /var/logs/messages shows the following:

Oct  2 11:16:49 localhost kernel: ata4.00: qc timeout (cmd 0xec)
Oct  2 11:16:49 localhost kernel: ata4.00: failed to IDENTIFY (I/O
error, err_mask=0x4)
Oct  2 11:16:49 localhost kernel: ata4.00: revalidation failed
(errno=-5)
Oct  2 11:16:49 localhost kernel: ata4: failed to recover some devices,
retrying in 5 secs
Oct  2 11:16:54 localhost kernel: ata4: hard resetting link
Oct  2 11:16:56 localhost kernel: ata4: SATA link up 1.5 Gbps (SStatus
113 SControl 0)
Oct  2 11:17:26 localhost kernel: ata4.00: qc timeout (cmd 0xec)
Oct  2 11:17:26 localhost kernel: ata4.00: failed to IDENTIFY (I/O
error, err_mask=0x4)
Oct  2 11:17:26 localhost kernel: ata4.00: revalidation failed
(errno=-5)
Oct  2 11:17:26 localhost kernel: ata4: failed to recover some devices,
retrying in 5 secs
Oct  2 11:17:31 localhost kernel: ata4: hard resetting link
Oct  2 11:17:33 localhost kernel: ata4: SATA link up 1.5 Gbps (SStatus
113 SControl 0)
Oct  2 11:18:03 localhost kernel: ata4.00: qc timeout (cmd 0xec)
Oct  2 11:18:03 localhost kernel: ata4.00: failed to IDENTIFY (I/O
error, err_mask=0x4)
Oct  2 11:18:03 localhost kernel: ata4.00: revalidation failed
(errno=-5)
Oct  2 11:18:03 localhost kernel: ata4.00: disabled
Oct  2 11:18:04 localhost kernel: ata4: hard resetting link
Oct  2 11:18:06 localhost kernel: ata4: SATA link up 1.5 Gbps (SStatus
113 SControl 0)
Oct  2 11:18:06 localhost kernel: ata4: EH complete
Oct  2 11:18:06 localhost kernel: sd 3:0:0:0: [sdc] Result:
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
Oct  2 11:18:06 localhost kernel: end_request: I/O error, dev sdc,
sector 976767935
Oct  2 11:18:06 localhost kernel: Buffer I/O error on device sdc1,
logical block 488383936
Oct  2 11:18:06 localhost kernel: Buffer I/O error on device sdc1,
logical block 488383937
Oct  2 11:18:06 localhost kernel: Buffer I/O error on device sdc1,
logical block 488383938
Oct  2 11:18:06 localhost kernel: Buffer I/O error on device sdc1,
logical block 488383939
Oct  2 11:18:06 localhost kernel: sd 3:0:0:0: [sdc] Result:
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
Oct  2 11:18:06 localhost kernel: end_request: I/O error, dev sdc,
sector 976767935
Oct  2 11:18:06 localhost kernel: Buffer I/O error on device sdc1,
logical block 488383936
Oct  2 11:18:06 localhost kernel: sd 3:0:0:0: [sdc] Result:
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
Oct  2 11:18:06 localhost kernel: end_request: I/O error, dev sdc,
sector 976767937
Oct  2 11:18:06 localhost kernel: Buffer I/O error on device sdc1,
logical block 488383937
Oct  2 11:18:06 localhost kernel: Buffer I/O error on device sdc1,
logical block 488383938
Oct  2 11:18:06 localhost kernel: Buffer I/O error on device sdc1,
logical block 488383939
Oct  2 11:18:06 localhost kernel: sd 3:0:0:0: [sdc] Result:
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
Oct  2 11:18:06 localhost kernel: end_request: I/O error, dev sdc,
sector 63
Oct  2 11:18:06 localhost kernel: Buffer I/O error on device sdc1,
logical block 0
Oct  2 11:18:06 localhost kernel: sd 3:0:0:0: [sdc] Result:
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
Oct  2 11:18:06 localhost kernel: end_request: I/O error, dev sdc,
sector 65
Oct  2 11:18:06 localhost kernel: Buffer I/O error on device sdc1,
logical block 1
Oct  2 11:18:06 localhost kernel: sd 3:0:0:0: [sdc] Result:
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
Oct  2 11:18:06 localhost kernel: end_request: I/O error, dev sdc,
sector 63
Oct  2 11:18:06 localhost kernel: sd 3:0:0:0: [sdc] Result:
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
Oct  2 11:18:06 localhost kernel: end_request: I/O error, dev sdc,
sector 65
Oct  2 11:18:06 localhost kernel: sd 3:0:0:0: [sdc] Result:
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
Oct  2 11:18:06 localhost kernel: end_request: I/O error, dev sdc,
sector 65
Oct  2 11:18:06 localhost kernel: hfs: unable to find HFS+ superblock
Oct  2 11:23:03 localhost kernel: sd 3:0:0:0: [sdc] Result:
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
Oct  2 11:23:03 localhost kernel: end_request: I/O error, dev sdc,
sector 65
Oct  2 11:23:03 localhost kernel: EXT3-fs: unable to read superblock

One thing that sticks out for me in all this is the SATA data rate.
Both the computer and the drive are supposed to be 3.0Gb/s devices.  Yet
the driver wants to connect at 1.5 Gbps.

The Serial ATA Controller is listed as ahci in hwbrowser.

# /sbin/lsmod | grep sat
sata_sil24             16069  0
libata                131937  3 ata_piix,sata_sil24,ahci


How should I proceed to get my external drive working ?

Thanks









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