请教一个问题:hdparm -c1 /dev/hda5为什么没有成功？

# hdparm -c1 /dev/hda5

/dev/hda5:
setting 32-bit IO_support flag to 1
HDIO_SET_32BIT failed: Invalid argument
IO_support = 0 (default 16-bit)
难道我硬盘不支持？

# hdparm -I /dev/hda5

/dev/hda5:

ATA device, with non-removable media
Model Number: ST340810A
Serial Number: 3FB0YPJB
Firmware Revision: 3.34
Standards:
Supported: 6 5 4 3
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: 71682031
device size with M = 1024*1024: 35000 MBytes
device size with M = 1000*1000: 36701 MBytes (36 GB)
Capabilities:
LBA, IORDY(can be disabled)
bytes avail on r/w long: 4 Queue depth: 1
Standby timer values: spec'd by Standard
R/W multiple sector transfer: Max = 16 Current = ?
Advanced power management level: unknown setting (0x0040)
Recommended acoustic management value: 128, current value: 128
DMA: 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=240ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* READ BUFFER cmd
* WRITE BUFFER cmd
* Host Protected Area feature set
* Look-ahead
* Write cache
* Power Management feature set
Security Mode feature set
SMART feature set
* Device Configuration Overlay feature set
* Automatic Acoustic Management feature set
SET MAX security extension
* Advanced Power Management feature set
* DOWNLOAD MICROCODE cmd
* SMART self-test
* SMART error logging
Security:
Master password revision code = 65534
supported
not enabled
not locked
not frozen
not expired: security count
not supported: enhanced erase
HW reset results:
CBLID- above Vih
Device num = 0 determined by CSEL
Checksum: correct

郁闷，一个都打不开
/dev/hda5:
multcount = 0 (off)
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 65535/16/63, sectors = 11888037, start = 12289788