----- Message from [email protected] ---------
Date: Mon, 7 Feb 2011 00:39:08 -0500
From: [email protected]
Subject: Re: mount and umount large capacity external USB HDD (fstab)
To: [email protected]
Cc: [email protected]
Lastly, we don't fully understand, nor have we found an article or man
page that explains (in a way we can understand), how to use the 'bs= ' to
the 'dd' command.
Within the 'man dd' the examples show 'bs=512' however, in the FreeBSD
Handbook 18.3.2.1 Using Slices, they demonstrate dd using 'bs=1k'; we
continue to be confused. Should we take this confusion to another list?
bs is the block size for the transfers. If you want to fill a harddisk
you want to use a big blocksize such as bs=1m. When you have a smaller
block size dd will be more busy pushing the blocks around which will
only increase CPU load and lower your transfer rate.
As for the unit following the number:
Where sizes are specified, a decimal, octal, or hexadecimal number of
bytes is expected. If the number ends with a ``b'', ``k'', ``m'', ``g'',
or ``w'', the number is multiplied by 512, 1024 (1K), 1048576 (1M),
1073741824 (1G) or the number of bytes in an integer, respectively. Two
or more numbers may be separated by an ``x'' to indicate a product.
----- End message from [email protected] -----
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