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Title

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1		-Commands
	1	+Linux General Documentation

Parent

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1		-Documentation.Miscellaneous.Linux.WebHome
	1	+iXPath Documentation.WebHome

Content

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17	17	down
18	18	{{/code}}
19	19
20		-== Test disk speed ==
21		-
22		-dd command allows to copy all or parts of a disk by bytes block without impact from content structure of the disk.
23		-
24		-(% class="box warningmessage" %)
25		-(((
26		-Use dd command with caution as it can cause severe dammage to the system
27		-Do not use dd to duplicate a disk. Prefer ddrescue command
28		-)))
29		-
30		-Command structure
31		-
32		-(% class="box" %)
33		-(((
34		-dd if=<source> of=<target> bs=<block size> count=<number of blocks> oflag=<flag>
35		-)))
36		-
37		-oflag: 'dsync' to use synchronized I/O for data
38		-
39		-{{code language="shell"}}
40		-dd if=/dev/zero of=/tmp/test2.img bs=512 count=1000 oflag=dsync
41		-1000+0 records in
42		-1000+0 records out
43		-512000 bytes (512 kB, 500 KiB) copied, 1.22846 s, 417 kB/s
44		-{{/code}}
	20	+