The use of DD

1. Generate an empty file with a size of 1G (files with holes)
$ dd If=/dev/zero of=winxp.img bs=1k seek=1024k count=1

2. Read the floppy disk and save it to a file with 16 binary
#dd if=/dev/fd0 bs=1k count=1440 | Od–tx1–ax >/tmp/dump_hex
-TX1: The format of the output is expressed as a single-byte (1) Form in 16 binary form (x)
-ax: Address offset in 16 binary form (x)

3. Backup the primary boot sector MBR of the hard disk
#dd If=/dev/hda Of=mbr.bak bs=512 count=1
#od –ax–tx2 Mbr.bak

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The use of DD