OT: paging MAC expert(s) --- What's a Performa?

From: Christopher Smith <csmith_at_amdocs.com>
Date: Tue Nov 20 09:23:52 2001

> -----Original Message-----
> From: Richard Erlacher [mailto:edick_at_idcomm.com]

> drive are to be found in the tape image, I'd submit it would
> be a mite tedious.

Well, I didn't say it would be easy ;) It's one of those things that is
theoretically simple.

> physically identical to the one you started with, i.e. same
> number of heads,
> cylinders, sectors, etc, PHYSICALLY, else things fall apart,
> since we don't know
> how the drive firmware deals with translating from the
> block-level commands the
> OS may choose to send it, though it doesn't have to, to the
> buffers-full of data
> that the drive coughs up.

There must be a method of block-by-block access that will give you the
sequence of data you need. Otherwise things would have already fallen
apart, and disks would be write-only devices. :) It probably helps to think
of the filesystem as a data set, rather than a device-dependant entity. The
data is the same, up to a point, no matter what you write it to.

Of course, whether the amount of translation you'd need to do to find that
essential data set is too much work, is arguable....

> potentially, to
> deal with the data to be transferred to the newly cleaned
> drive in the same way
> that this particular OS deals with it. Of course, the OS
> doesn't know what
> you're doing, and doesn't know how to read the data on the
> disk, except as raw
> data, dealt with in buffer-fulls, and than only using the
> code you've written.

I'm not sure I follow your train of thought here. It's early, though.

Regards,

Chris


Christopher Smith, Perl Developer
Amdocs - Champaign, IL

/usr/bin/perl -e '
print((~"\x95\xc4\xe3"^"Just Another Perl Hacker.")."\x08!\n");
'
 
Received on Tue Nov 20 2001 - 09:23:52 GMT