Date: Mon, 07 Feb 2011 08:56:25 +0100 From: Nagilum <nagilum@nagilum.org> To: email@guice.ath.cx Cc: freebsd-usb@freebsd.org, Duane.Hesser@gmail.com Subject: Re: mount and umount large capacity external USB HDD (fstab) Message-ID: <20110207085625.66671jlvqglhs0bo@10.1.1.1> In-Reply-To: <a805de4dcfa867d9b99cac49f8108004.squirrel@wtp1.ath.cx> References: <a805de4dcfa867d9b99cac49f8108004.squirrel@wtp1.ath.cx>
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----- Message from email@guice.ath.cx ---------
Date: Mon, 7 Feb 2011 00:39:08 -0500
From: email@guice.ath.cx
Subject: Re: mount and umount large capacity external USB HDD (fstab)
To: Duane.Hesser@gmail.com
Cc: freebsd-usb@freebsd.org
> 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@guice.ath.cx -----
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