On 08/05/2010 10:58, Rich Mellor wrote:
On 08/05/2010 10:51, gdgqler wrote:
On 8 May 2010, at 10:41, Rich Mellor wrote:
Does anyone have the details of the standard Sinclair QL disk
format for a DSDD disk:
MFM/FM ? number of track , number of side, sector per track, sector
size, bitrate
From memory - I think it is:
80 tracks
Yes
2 sides
Yes
Sectors per track?
Nine
Sector size 512K
Yes
bitrate?
What do you mean?
George
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Actually, I would hope it was 512 bytes per sector.
Thinking about it, surely it is 18 sectors per track?
0.5 (K) x 18 x 80 = 720K
Not sure about what they want to know about bitrate - presumably the
speed of transfer the QL can cope with!
Oops that is just DD disks.
HD - 160 tracks, gives 0.5 (K) x 18 x 160 = 1440K
ED disk drives I think used 1024 bytes per sector -> 1 (K) x 18 x ?? = 3200K
Not sure about the data for ED disks
The emulators all suffer from having a fixed number of tracks on a disk
- assuming 80 or 160. The QL could detect the number of tracks somehow,
which is how some commercial disks were formatted to a slower capacity
to speed up duplication....
--
Rich Mellor
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