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Article #320

Re: Why does sectors*2K not equal total data on some CD-ROMs???

#320
From: Mark Griffiths
Date: Tue, 13 Jan 1998 00:00
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Mike Richter (mrichter@mindspring.com) wrote:
: Have you compared with the total number of bytes in files or with the
: amount of space that would be needed on a 650-MB hard drive? Because the
: data must be interpreted as though the TOC were a FAT, you lose space at
: the end of sectors as though you had a FAT there. To get a factor of
: two, you would have had to have had lots of small files and (probably)
: lots of directories.

A 650MB hard disk formated with FAT32 will normally have 4096 byte
clusters (yes you can change it).  Formatted with FAT16, the cluster size
will be 16384 bytes.  Both of these are greater than the 2048 byte
sectors used on CDs, meaning larger amounts of slack on the hard drive.
Also, directories on hard disks (and floppies) are actually special types
of files, hence the same problem of small directories wasting large
amounts of space.  AFAIK, the TOC on a CD is simply a list of filenames
with a starting sector number as well as a bit of other data, hence
directories on CDs shouldn't waste space in the same way.

Although the original post mentioned something about only 1 track, it may
be that he is actually looking at a multi-session CD - Multi-session CDs
tend to waste a huge amount of space, especially if only a small amount
of data is added with each session.

Regards,
Mark Griffiths.
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From: zzmgriff@uq.net.au (Mark Griffiths)
Subject: Re: Why does sectors*2K not equal total data on some CD-ROMs???
Date: 1998/01/13
Message-ID: <69fg6d$5rf$2@nargun.cc.uq.edu.au>
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