Path: utzoo!utgpu!watmath!clyde!att!ihlpf!bird From: bird@ihlpf.ATT.COM (Walters) Newsgroups: comp.sys.apple Subject: Usabale blocks on ProDOS data disk Keywords: ProDOS Message-ID: <7682@ihlpf.ATT.COM> Date: 13 Feb 89 01:03:58 GMT Organization: AT&T Bell Laboratories - Naperville, Illinois Lines: 52 When I updated my AppleWorks 2.0 to 2.1 I specified that I wanted the update to be on a 3.5 disk. Unfortunately when it arrived I did not yet own such a drive. I asked a friend to copy the files from the 3.5 to two sides of a 5.25 disk. By looking at my copy of version 2.0 I knew which files were on which side of the disk. Unfortunately, the three files that were supposed to go onto side 2 would not fit. We had to put one of the three on side 1. (SEG.PR was the "obvious" choice.) Doing the above caused me to flip the disk two extra times when booting (seems that SEG.PR is loaded second). In addition, getting any of the Timeout series onto the disk was real fun. I finally found someone that had updated and requested the 5.25 format. Looking at that disk I saw that the files were the same size as he 3.5 format files and they were placed on the two sides exactly as they were for version 2.0 i.e., the way I tried to get them and was unsuccessful. Continuing, if you format a ProDOS disk and then CATALOG it you are told: Blocks Total Blocks Free Blocks Used 280 273 7 If you catalog the program disk for Appleworks version 2.1 you are told: Blocks Total Blocks Free Blocks Used 280 2 278 There are thee files on the disk and their size is: SEG.MO SEG.M1 SEG.PR 46 219 9 As expected, the disk total is still 280, however, the three files total 274. Add blocks free to this you get 276. This leads to a number of questions: 1. What happened to the missing 4 blocks (280-276)? Or 278-274 if you look at blocks used and the total file sizes. 2. How did Apple get one extra block on the disk? (274 when formatting a disk only leaves you with 273) 3. Are they somehow breaking their own rules on disk usage? If not, how can I "break" the same rules and gain some additional storage on my disks? 4. Do the answers to the above questions apply to 3.5 disks as well? -- Joe Walters att!ihlpf!bird IHP 1F-240 (312) 416-5356