从磁盘读取单个扇区 [英] Read a single sector from a disk

问题描述

我正在尝试直接从磁盘读取单个特定扇区.我目前的想法已经用完了，关于如何实现它的任何建议都很棒！

I am trying to read a single specific sector from the disk directly. I've currently run out of ideas and any suggestions how to go about it would be great!

推荐答案

尝试通过CLI进行类似操作:

Try something like this to do it from the CLI:

# df -h .
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              27G   24G  1.6G  94% /
# dd bs=512 if=/dev/sda2 of=/tmp/sector200 skip=200 count=1
1+0 records in
1+0 records out

来自man 4 sd:

FILES
   /dev/sd[a-h]: the whole device
   /dev/sd[a-h][0-8]: individual block partitions

如果要在程序中执行此操作，只需将man 2 ...之类的man 2 ...和read之类的系统调用与dd示例中的参数结合使用即可.

And if you want to do this from within a program, just use a combination of system calls from man 2 ... like open, lseek,, and read, with the parameters from the dd example.

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