The Natural Philosopher  writes:
> On 09/04/17 17:16, Raymond Wiker wrote:
>> Ahem A Rivet's Shot  writes:
>>
>>> On Sat, 08 Apr 2017 19:46:53 -0700
>>> "DisneyWizard the Fantasmic!"  wrote:
>>>
>>>> [SOLVED] {dd if=/dev/sdb of=/dev/sda &} duplicates terabyte drives.
>>>
>>>  It will go much faster with bs=64k added to the arguments.
>>
>> Probably even faster with (a little higher) blocks... and using raw
>> devices (/dev/rsd{a,b}) may also help.
>>
> ls -l /dev/rs*
> ls: cannot access /dev/rs*: No such file or directory
>
> In fact e raw devices are IIRC /dev/sd[abcd] etc.
> The partitions are /dev/sd[abcd][12345...]

In Linux raw devices means the cache is bypassed; see ‘man raw’. For
this application I wouldn’t bother.

--
http://www.greenend.org.uk/rjk/

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