Date: Wed, 25 Jul 2001 12:25:45 -0230
Reply-To: Chad Worthman <chadw@BIGFOOT.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Chad Worthman <chadw@BIGFOOT.COM>
Subject: Re: Can data be read directly from a CD?
I've experienced data corruption when accessing large SAS datasets over a
slow network. SAS was processing the data faster than it arrived and it
resulted in corrupted datasets. This was on Windows NT and SAS 6.12. It
was bug, but it could be possible with CD read buffers as well.
"Gerhard Hellriegel" <ghellrieg@T-ONLINE.DE> wrote in message
> On Wed, 25 Jul 2001 11:24:51 -0230, Chad Worthman <chadw@BIGFOOT.COM>
> The buffer underruns mentioned below are not a problem with READING CDs.
> Even if your CD-drive is very slow, it simly last longer to read the data.
> The buffer underruns are related to burning a CD-R! There the target CD
> could be destroyed, if a buffer underrun occures, that means, the data-
> stream is interrupted during output. Never the source is destroyed, even
> it is a CD!
> >You will not damage a CD by reading data from it. On a PC, the CDROM
> >is just like any other drive for reading data. You won't be able to
> >data to a CD drive from inside SAS, unless you have something like
> >DirectCD installed.
> >You may want to try reading directly from the CD and also copying the CD
> >data to the hard drive first to compare performance. Also, if your CDROM
> >drive is slow, I'm not sure how SAS would react to buffer underruns.
> >Chad Worthman
> >Dansys Consultants Inc.
> >"Aldi Kraja" <email@example.com> wrote in message
> >> Good morning,
> >> Is there a way to read data provided in ASCII format from a CD? Or
> >> better is there a way SAS will recognize a CD as a storage place from
> >> where can be retrieved information? I am asking this question, because
> >> each CD has about 0.7 GB data, and I want to transfer data directly in
> >> SAS format into the hard drive of the system. My concern is if I am
> >> going to damage the CDs if I try the regular way of reading data with
> >> FILENAME sample "F:\data1.kot"; and INFILE sample ...?
> >> TIA,
> >> Aldi
> >> --