RedHat Linux下IDE硬盘的加速。
默认中Redhat Linux将IDE硬盘配置得非常稳定，非常兼容，换句话来说，就是非常的慢。
如果你的IDE硬盘是最近几年，特别注明是支持UltraDMA模式的，可以通过修改配置文件轻而易举地使得你的IDE硬盘加速它的运行。
编辑/etc/sysconfig/harddisks, 修改自己的IDE硬盘（注：对SCSI硬盘无效）。红色字体是修改后的参数：
[quote1]#
# WARNING !!!
#
# The kernel will autodetect the correct settings for most drives.
# Overriding these settings with hdparm can cause data corruption and/or
# data loss.
# Leave this file as it is unless you know exactly what you're doing !!
#
#
#
# These options are used to tune the hard drives -
# read the hdparm man page for more information
# Set this to 1 to enable DMA. This might cause some
# data corruption on certain chipset / hard drive
# combinations. This is used with the "-d" option
USE_DMA=1 (这不用再说明了吧？) [/color:10271efaf1]
# Multiple sector I/O. a feature of most modern IDE hard drives,
# permitting the transfer of multiple sectors per I/O interrupt,
# rather than the usual one sector per interrupt. When this feature
# is enabled, it typically reduces operating system overhead for disk
# I/O by 30-50%. On many systems, it also provides increased data
# throughput of anywhere from 5% to 50%. Some drives, however (most
# notably the WD Caviar series), seem to run slower with multiple mode
# enabled. Under rare circumstances, such failures can result in
# massive filesystem corruption. USE WITH CAUTION AND BACKUP.
# This is the sector count for multiple sector I/O - the "-m" option
#
MULTIPLE_IO=16 (这个以前叫multcount, 多少sector能在一次输入／输出中断中被校入)[/color:10271efaf1]
# (E)IDE 32-bit I/O support (to interface card)
#
EIDE_32BIT=3 (打开这个是非常重要的，几乎可以提速一倍)[/color:10271efaf1]
# Enable drive read-lookahead
#
LOOKAHEAD=1 (没什么话好说的，个人觉得都无所谓)[/color:10271efaf1]
# Add extra parameters here if wanted
# On reasonably new hardware, you may want to try -X66, -X67 or -X68
# Other flags you might want to experiment with are -u1, -a and -m
# See the hdparm manpage (man hdparm) for details and more options.
#
EXTRA_PARAMS= -X66 -u1 (这里的选项很危险，要根据自己的情况填入。请先用/sbin/hdparm 命令确认这些选项不会危害到你的IDE硬盘，再将它们写入这里。[/color:10271efaf1]
[/quote1]
其实上面的参数都可以用hdparm来调整，但系统是不会记住hdparm调整后的参数的。所以每次开机又会回到默认的配置。修改/etc/sysconfig/harddisks文件是为了方便，用户也可以将hdparm的选项写入rc.sysinit。仁者见仁了。
