10-20-2011
You only get to do bs=...G if you have GNU dd.
Advertised tape sizes are very often inflated. We don't know his tapes actually are 600GB, i.e. whether that means real gigabytes or drivemaker's gigabytes, uncompressed or with theoretical max compression, etc. The only way to be sure of that is to use the capacity in blocks as defined by the manufacturer.
Blocks versus bytes is grade-school math, 1024 bytes is two 512-byte blocks...
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AMDD(8) System Manager's Manual AMDD(8)
NAME
amdd - Amanda version of dd
SYNOPSIS
amdd [ -d ] [ if=input ] [ of=output ] [ bs=blocksize ] [ skip=count ] [ count=count ]
DESCRIPTION
Amdd provides just enough of the standard dd command for the needs of Amanda. This is handy when doing a full restore and the standard dd
program has not yet been found.
Amdd also provides access to the Amanda output drivers that support various tape simulations. This may be used for debugging or to convert
from one format to another.
See the amanda(8) man page for more details about Amanda. See the OUTPUT DRIVERS section of amanda(8) for more information on the Amanda
output drivers.
OPTIONS
-d Turn on debugging output.
-llength
Set the output length. If the output driver limits the output size, this controls when end of tape will be simulated.
Length may have a multiplier suffix:
k 1024 (Kilobytes)
b 512 (Blocks)
M 1024*1024 (Megabytes)
The default is no multipler (bytes).
if=input
Input to dd. Default is stdin.
of=output
Where to send the output of dd. Default is stdout.
bs=blocksize
Size of each record. Input records smaller than this will not be padded. Output records will be the same size as the corresponding
input record. Default is 512 bytes.
Blocksize may have a multiplier suffix:
k 1024 (Kilobytes)
b 512 (Blocks)
M 1024*1024 (Megabytes)
The default is no multipler (bytes).
count=count
Number of records to copy. Default is all records until end of file.
skip=count
Number of records to skip before copying input to output. Default is zero.
AUTHOR
Marc Mengel <mengel@fnal.gov>
John R. Jackson <jrj@purdue.edu>
SEE ALSO
amanda(8)
AMDD(8)