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关于 在FreeBSD 下fdisk 察看详细分区表的方法
我以前一直没搞清,这次被biglei一句点醒,赶快查找,就彻底搞清楚了。
(我只有一个IDE硬盘,就是ad0了,个人根据自己不同情况自己决定。)
先用
fdisk 找出已有的Sile (割片)
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- KXAPPLE# fdisk
- ******* Working on device /dev/ad0 *******
- parameters extracted from in-core disklabel are:
- cylinders=19885 heads=16 sectors/track=63 (1008 blks/cyl)
- Figures below won't work with BIOS for partitions not in cyl 1
- parameters to be used for BIOS calculations are:
- cylinders=19885 heads=16 sectors/track=63 (1008 blks/cyl)
- Media sector size is 512
- Warning: BIOS sector numbering starts with sector 1
- Information from DOS bootblock is:
- The data for partition 1 is:
- sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
- start 63, size 20044017 (9787 Meg), flag 80 (active)
- beg: cyl 0/ head 1/ sector 1;
- end: cyl 1023/ head 15/ sector 63
- The data for partition 2 is:
- <UNUSED>
- The data for partition 3 is:
- <UNUSED>
- The data for partition 4 is:
- <UNUSED>
- KXAPPLE#
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可以用 disklabel /dev/ad0s1 (后面跟上硬盘Sile 的编号)。
- KXAPPLE# disklabel /dev/ad0s1
- # /dev/ad0s1:
- 8 partitions:
- # size offset fstype [fsize bsize bps/cpg]
- a: 409600 0 4.2BSD 2048 16384 25608
- b: 2097152 409600 swap
- c: 20044017 0 unused 0 0 # "raw" part, don't edit
- d: 409600 2506752 4.2BSD 2048 16384 25608
- e: 614400 2916352 4.2BSD 2048 16384 38408
- f: 4194304 3530752 4.2BSD 2048 16384 28552
- g: 12318961 7725056 4.2BSD 2048 16384 28552
- KXAPPLE#
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另外,自从FreeBSD 5.1 开始,多了diskinfo 指令。---FreeBSD.org 官方文档。
可以直接检测出硬盘相关参数:
disk -v /dev/ad0 (跟硬盘设备名) 显示硬盘详细参数
disk -t /dev/ad0 (同上) 显示硬盘详细参数 + 简单测试硬盘性能
我的,破机器 昆腾火球 10G 5400RPM:
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- KXAPPLE# diskinfo -t /dev/ad0
- /dev/ad0
- 512 # sectorsize
- 10262568960 # mediasize in bytes (9.6G)
- 20044080 # mediasize in sectors
- 19885 # Cylinders according to firmware.
- 16 # Heads according to firmware.
- 63 # Sectors according to firmware.
- Seek times:
- Full stroke: 250 iter in 5.046828 sec = 20.187 msec
- Half stroke: 250 iter in 3.924461 sec = 15.698 msec
- Quarter stroke: 500 iter in 6.666424 sec = 13.333 msec
- Short forward: 400 iter in 3.179931 sec = 7.950 msec
- Short backward: 400 iter in 3.560683 sec = 8.902 msec
- Seq outer: 2048 iter in 0.399103 sec = 0.195 msec
- Seq inner: 2048 iter in 0.407728 sec = 0.199 msec
- Transfer rates:
- outside: 102400 kbytes in 4.685254 sec = 21856 kbytes/sec
- middle: 102400 kbytes in 5.283395 sec = 19381 kbytes/sec
- inside: 102400 kbytes in 8.221931 sec = 12454 kbytes/sec
- KXAPPLE#
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