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：
| # # 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？) # 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) # (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) # Enable drive read-lookahead # LOOKAHEAD=1 (没什么话好说的，个人觉得都无所谓) # 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。 |
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。
