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Re: [vox-tech] backing up the master boot record
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Re: [vox-tech] backing up the master boot record

begin: jdnewmil@dcn.davis.ca.us <jdnewmil@dcn.davis.ca.us> quote
> That would be nice, but it is in
>  man dd
> if you interpolate:
> ---Quote---
>        count=BLOCKS
>               copy only BLOCKS input blocks
>        ibs=BYTES
>               read BYTES bytes at a time
> [...]
>        obs=BYTES
>               write BYTES bytes at a time
> [...]
>        seek=BLOCKS
>               skip BLOCKS obs-sized blocks at start of output
>        skip=BLOCKS
>               skip BLOCKS ibs-sized blocks at start of input

here's what i know:
 cylinders are stacked circles.
 heads are sides.
 sectors are arcs.
 tracks circles.
 cluster are the smallest group of sectors a file can use.

maybe i'm not good at interpolating, but i'm still not understanding.
are you saying that a block is a cluster?  is it a filesystem term or
a dd term?


> <hypothesizing>There is something historical about dd that I never quite
> understood.  It was described to me as a tool for converting data from
> storage on one type of device to storage on another, with 9-track tapes
> from various sources being common examples at the time it was described to
> me.  Of course, I have only used a 9-track tape once, and that was on a
> VMS system, so I don't know much about them.  I imagine that if a device
> driver could only support certain block sizes, a tool like dd would be
> useful for extracting data from tapes with an odd block size and putting
> it on tapes with a size more to your liking.  I don't know if such
> restrictions remain in modern device drivers...</hypothesizing>

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