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What's with CD-RW? - Mac Portable

On 20/7/03 9:05 AM, in article 1fye6fs.13prxwuejm194N%dwrightmetz.une.edu.au, "Denis Wright" <dwrightmetz.une.edu.au> wrote: > GCZ <gczoptusnet.com.au> wrote: > >> Plain non-rewrite CD's are really cheap - I don't see what the big problem >> is. > > I think you have to be prepared to use your CD burning capability in a > different way from a zip disk or floppy. There DO seem to be issues with > writing multiple sessions and maybe the time will come when someone > builds into the operating system the ability to use a CD pretty much > like a zip disk. But until that ...

  1. #1

    Default Re: What's with CD-RW?

    On 20/7/03 9:05 AM, in article
    1fye6fs.13prxwuejm194N%dwrightmetz.une.edu.au, "Denis Wright"
    <dwrightmetz.une.edu.au> wrote:
    > GCZ <gczoptusnet.com.au> wrote:
    >
    >> Plain non-rewrite CD's are really cheap - I don't see what the big problem
    >> is.
    >
    > I think you have to be prepared to use your CD burning capability in a
    > different way from a zip disk or floppy. There DO seem to be issues with
    > writing multiple sessions and maybe the time will come when someone
    > builds into the operating system the ability to use a CD pretty much
    > like a zip disk. But until that time, your best bet is to do your
    > backups on zip disks or remote system until you have enough data on them
    > to warrant burning a CD. I agree with GCZ that once-only writable CDs
    > are the best bet for this form of storage, with a limited number (say a
    > maximum of 3) of sessions on each.
    >
    > Denis
    >
    I have found a partial solution for my situation using Toast 5.2 (Titanium).
    You can do incremental backups using ISO9660. This means that a CD-R will
    slowly fill up as files that have changed are added to the CD. For example,
    I have about 200MB in my doents and mail folders. Over the course of a
    few days, about 12MB worth of data changed. Thus, the CD now has 212MB of
    space used leaving nearly 390MB to go. This works with either CD-R or CD-RW.
    Obviously, once you have filled a CD-R, you need to create a new incremental
    backup disk. I guess with a CD-RW, I could erase it and start again (haven't
    done this yet).

    Cheers,
    Duncan.

    Duncan Farrow Guest

  2. #2

    Default Re: What's with CD-RW?



    Mr Dewsons wrote:
    >
    > In article <3F1FDEB3.5C0925F6iprimus.com.au>,
    > Duncan Farrow <duncanfarrowiprimus.com.au> wrote:
    >
    > > Mr Dewsons wrote:
    > > >
    > > > In article <BB4328F9.147B%duncanfarrowiprimus.com.au>,
    > > > Duncan Farrow <duncanfarrowiprimus.com.au> wrote:
    > >
    > > === SNIP ===
    > >
    === SNIP Again ==
    > > Not sure what you mean about 'waste'. Under incremental backup, only
    > > those files that have changed are added to the CD. Thus, if you have
    > > used 200MB of available space on a CD-R and 20MB worth of files have
    > > changed since your last back up, 20MB extra gets burned meaning you
    > > have now used 220MB of space. It is only the space taken up by the
    > > original files that becomes wasted. At least, that's my understanding.
    >
    > I remember reading in the Toast manual that when you write the first
    > session of a disc, you lose 22 megs off it. So if you've got a 1 meg
    > file written to the first session, that session will take up 23 megs.
    > Any subsequent sessions will take up at least 12 megs - it'll be 12 megs
    > plus whatever the size of the files is.
    >
    > Haven't you ever looked at the bottom of a multisession disc and
    > actually been able to see the space in between sessions?
    No I haven't and I misunderstood your earlier remarks. Next time
    I do an incremental backup, I'll make a point of looking at the
    space used.

    Cheers,
    Duncan.
    Duncan Farrow Guest

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