Hallo Andre, > What I think you are going to do is: You make a 16M disk image and > your program writes the files like on a D64 file only more sectors and > tracks, right? Right. > Well, this B-R thing is the only advantage I can see of using a 16M disk > image instead of using the filesystem directly. Actually I would not want > to waste 16M for a single image disk that is probably halfway empty or so... I've some 20 MB disks and loose 286-boards laying around doing nothing at all. You may guess what I'm going to do with them.... > What I mean with using the filesystem directly using the hosts > filesystem, producing single .P** or whatever files for each file saved. > The VICE emulator handles this fine for example. > This way no empty space is wasted for a more or less empty disk image. > Only if full compatibility is needed one uses .d64 images. But > there is no use creating a new type of disk image, because there is > no program compatible to it. But more compatible then a P00-file, IMHO. > Only the .D** files are like disk images with tracks/sector > For a bit more on the old disks see > http://www.tu-chemnitz.de/%7efachat/8bit/petindex/disks.html > Sorry, don't have the table of which track has how many sectors. Schade. Kein Problem, hat Zeit. But I did encounter another problem concerning D16: what about the BAM? Can anybody tell me how the 1581 handles this? My first idea is to reserve 9 complete sectors for this: one for the free sectors on every track and 8 for bitwise representation of each track. Hallo Per, > I should be able to dig that out if someone really needs to know. If you do have at hand, please do. Anyway I digged up this: Drive: Total bytes: Dir entries: sectors per track: tracks: blocks 8050 533248 224 23 to 29 77 2083 2040/3040 176640 152 17 to 21 35 690 4040 174848 144 17 to 21 35 683 The DISK REFERENCE MANUAL also gives some numbers about the harddisks: 9090 9060 Formatted storage 7.47 MB 4.98 MB Cylindres (Tracks) 153 153 Sectors/Cylinder 128 192 Sectors per track 32 32 bytes per sector 256 256 Free blocks 29162 19942 I cannot figure out what they mean. Groetjes, Ruud - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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