Linux (both Fedora 14 and Ubuntu 10.10) is limiting my UDMA/133 PATA HDD
(my main system drive) to UDMA/33:
1.861688] ata7.00: ATA-7: Maxtor 6Y080L0, YAR41BW0, max UDMA/133
[ 1.861928] ata7.00: 156250000 sectors, multi 0: LBA
[ 1.862181] ata7.00: limited to UDMA/33 due to 40-wire cable
[ 1.868673] ata7.00: configured for UDMA/33
My IDE cable is an 80-wire cable (it has blue and black end-connectors
and a gray center-connector). The cable is connected with the correct
orientation (blue end-connector connected to motherboard, black
end-connector is connected to HDD). There is nothing connected to the
center connector. The HDD is jumpered for CS (cable-select).
The BIOS recognizes the HDD as UDMA/133. On bootup the BIOS displays a
screen which lists the HDD as UDMA mode 6 (which is UDMA/133).
Initially, I attached the IDE cable with the backward orientation, and
the BIOS recognized the HDD as UDMA mode 2 (UDMA/33).
The HDD is a Maxtor DiamondMax Plus 9 6Y080L0 80 GB PATA. The
motherboard IDE controller is VIA VT6330.
04:00.1 IDE interface: VIA Technologies, Inc. PATA IDE Host Controller
(rev a0) (prog-if 85 [Master SecO PriO])
Subsystem: VIA Technologies, Inc. PATA IDE Host Controller
Flags: bus master, fast devsel, latency 0, IRQ 16
I/O ports at e800 [size=8]
I/O ports at e400 [size=4]
I/O ports at e000 [size=8]
I/O ports at d800 [size=4]
I/O ports at d400 [size=16]
Expansion ROM at fe9f0000 [disabled] [size=64K]
Capabilities: [50] Power Management version 3
Capabilities: [70] MSI: Enable- Count=1/1 Maskable+ 64bit+
Capabilities: [90] Express Legacy Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [130] Device Serial Number 00-30-67-ff-ff-83-f3-23
Kernel driver in use: pata_via
Kernel modules: pata_via
A Google search shows that there are a number of bug reports for this
type of problem, but they are not recent:
1. Red Hat Bugzilla – Bug 429774
pata_via 40-wire cable wrong detection
Last modified: 2008-11-26 12:37:12 EST
2.Kernel Bug Tracker – Bug 10179
pata_amd libata: Erroneous "limited to UDMA/33 due to 40-wire cable"
from PX-130A
Last modified: 2008-06-18 03:28:03
3.Kernel Bug Tracker – Bug 8164
pata_via: wrong cable detection on PATA controller
Last modified: 2007-03-21 13:11:17
Questions:
---------
Q1: Is this a user error (something I'm overlooking in my hardware
setup) or a Linux bug?
Q2: If this is a Linux bug, should I try to reopen RedHat Bug 429774 or
submit a kernel bug report to kernel.org? (the bug occurs on Fedora 14
and Ubuntu 10.10)
Q3. I plan to eventually buy a SATA HDD. I'm waiting for a 4K sector HDD
(aka "Advanced Format") which does not do 512-byte sector emulation, i.e
4K native. In the meantime, if someone in the group within a 10-mile
radius of downtown Poughkeepsie has an unwanted SATA HDD, make me an
offer.
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