Transfer Rate Disk Post: 302504499

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Top Forums UNIX for Dummies Questions & Answers Transfer Rate Disk Post 302504499 by Corona688 on Monday 14th of March 2011 06:45:34 PM

03-14-2011

Registered User

Since this is Linux, if you send a SIGUSR1 to dd while it's in operation, it will print statistics to standard error.

Code:

# useless:  read /dev/zero, write /dev/null, in blocks of one megabyte
$ dd if=/dev/zero of=/dev/null bs=1048576 &
[1] 25076
$ killall -USR1 dd
4115+1 records in
4115+0 records out
4314890240 bytes (4.3 GB) copied, 2.38339 s, 1.8 GB/s
$ killall dd
[1]+  Terminated              dd if=/dev/zero of=/dev/null bs=1048576
$

It will also print a summary to standard error when it completes.

You may want to add "oflag=sync" to prevent cache effects from messing up your numbers.

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LEARN ABOUT REDHAT

fdformat

FDFORMAT(8)						     Linux Programmer's Manual						       FDFORMAT(8)

NAME

       fdformat - Low-level formats a floppy disk

SYNOPSIS

       fdformat [ -n ] device

DESCRIPTION

       fdformat  does  a  low  level  format on a floppy disk.	device is usually one of the following (for floppy devices, the major = 2, and the
       minor is shown for informational purposes only):

	      /dev/fd0d360  (minor = 4)
	      /dev/fd0h1200 (minor = 8)
	      /dev/fd0D360  (minor = 12)
	      /dev/fd0H360  (minor = 12)
	      /dev/fd0D720  (minor = 16)
	      /dev/fd0H720  (minor = 16)
	      /dev/fd0h360  (minor = 20)
	      /dev/fd0h720  (minor = 24)
	      /dev/fd0H1440 (minor = 28)

	      /dev/fd1d360  (minor = 5)
	      /dev/fd1h1200 (minor = 9)
	      /dev/fd1D360  (minor = 13)
	      /dev/fd1H360  (minor = 13)
	      /dev/fd1D720  (minor = 17)
	      /dev/fd1H720  (minor = 17)
	      /dev/fd1h360  (minor = 21)
	      /dev/fd1h720  (minor = 25)
	      /dev/fd1H1440 (minor = 29)

       The generic floppy devices, /dev/fd0 and /dev/fd1, will fail to work with fdformat when a non-standard format is being used, or if the for-
       mat has not been autodetected earlier.  In this case, use setfdprm(8) to load the disk parameters.

OPTIONS

       -n     No verify.  This option will disable the verification that is performed after the format.

SEE ALSO

       fd(4), setfdprm(8), mkfs(8), emkfs(8)

AUTHOR

       Werner Almesberger (almesber@nessie.cs.id.ethz.ch)

Linux 0.99							  1 February 1993						       FDFORMAT(8)