discuss: Re: Summary: CDR sizes (Was: Re: BBC To-Do List addition)]
Subject:
[Fwd: Summary: CDR sizes (Was: Re: BBC To-Do List addition)]
From:
Randy Kramer ####@####.####
Date:
20 Mar 2001 16:17:40 -0000
Message-Id: <3AB782BA.79F2@fast.net>
This is the second post I thought might be helpful. (Well, timewise,
this is the first, the other came later.) This only addresses a
business card cd with ~ 50 MB capacity.
Randy Kramer
On Sun, Feb 18, 2001 at 11:44:59AM +0000, Niall O Broin wrote:
> On Sat, Feb 17, 2001 at 11:11:45PM +0100, Andreas Klu?mann wrote:
>
> > I've got:
> >
> > ATIP info from disk:
> > Indicated writing power: 5
> > Is not unrestricted
> > Is not erasable
> > ATIP start of lead in: -11324 (97:31/01)
> > ATIP start of lead out: 95475 (21:15/00)
> > Disk type: Long strategy type (Cyanine, AZO or similar)
> > Manuf. index: 22
> > Manufacturer: Ritek Co.
>
> OK - I just did this for a BBC and some full size CDs and I got
>
> Full size (SONY) ATIP start of lead out: 336075 (74:43/00)
> Full size (Generic) ATIP start of lead out: 335100 (74:30/00)
> BBC ATIP start of lead out: 26850 (06:00/00)
>
> I've no idea what the initial numbers are (nor those in the lead-in values)
The initial numbers give the numbers of sectors (of 2048 Bytes each!).
Extra size (Memorex) ATIP start of lead out: 359849 (79:59/74)
359849 * 2048 Bytes = aprox. 702.8 MB
Full size (SONY) ATIP start of lead out: 336075 (74:43/00)
336075 * 2048 Bytes = aprox. 656.4 MB
Full size (Generic) ATIP start of lead out: 335100 (74:30/00)
335100 * 2048 Bytes = aprox. 654.5 MB
Full size (Kodak) ATIP start of lead out: 333226 (74:05/01)
333226 * 2048 Bytes = aprox. 650.8 MB
Mini CD ATIP start of lead out: 95475 (21:15/00)
95475 * 2048 Bytes = aprox. 186.5 MB
BBC ATIP start of lead out: 26850 (06:00/00)
26850 * 2048 Bytes = aprox. 52.4 MB
> but I think it's reasonable to make the assumption that the number in
> parentheses is the capacity in time, which I always understood to be 74
> minutes for a full size CD. This implies a time capacity for the BBC of 6
> minutes and I know that the data capacity of the BBC is fractionally more
> than 53708800 bytes (I made an ISO which was too big for the blank -
> cdrecord warns you - and I decided that I'd find out what was the maximum
> capacity. So I did some binary chops between the too big size and a size
> which I knew did fit, until I got the above figure).
taking your figure and the size from the output above results in about
1250 KBytes for fixating the disk!
> Extrapolating from the known figures, I get a capacity of ~ 181.4 MB for
> your mini CD blanks.
If it takes the same amount for fixating the disk i get ~ 185.25 MB for the mini CD blanks.
> Regards,
>
>
>
> Niall O Broin
>
>
Greetings Andreas
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