AWCTTYPA@UIAMVS.BITNET ("David A. Lyons") (02/17/89)
>Date: Thu, 16 Feb 89 04:03:16 GMT >Subject: Re: Usabale blocks on ProDOS data disk >By carefully reading _Beneath Apple DOS_ or _Beneath Apple ProDOS_ as >appropriate, you find that each directory can be extended or >shortened by sector-editing the pointers to "next sector/block" to >point to whatever sector or block you want. The only problems that I >have had is that 3rd party disk programs (like Copy II Plus) don't >fully interpret what is written on the disk. Also note that while ProDOS 8 and ProDOS 16 _will_ let you access the files beyond the 51st in an extended volume directory, those files will _not_ be visible to programs reading the directory (to display a catalog listing, for example), because the operating system returns "end of file encountered" after the first 2048 bytes (4 blocks) of the directory, even if there are more blocks. GET_EOF always returns 2048 on a volume directory under P8 and P16, and READ refuses to read past that point. >Brian Willoughby microsoft!brianw --David A. Lyons bitnet: awcttypa@uiamvs DAL Systems CompuServe: 72177,3233 P.O. Box 287 GEnie mail: D.LYONS2 North Liberty, IA 52317 AppleLinkPE: Dave Lyons