From: netnews@aquaporin4.com   
      
   "Peter Dassow"  wrote in message   
   news:4f971782$0$6555$9b4e6d93@newsspool4.arcor-online.net...   
   > On 21.04.2012 15:39, Guillaume Tello wrote:   
   >> Le 21/04/2012 13:37, Paolo a écrit :   
   >>> Please, what is the structure of a .ST file emulating an Atari ST   
   >>> floppy disk?   
   >>> It gets 738.260 B versus 726.016 on the FD.   
   >>> Thanks   
   >>> Paul   
   >>   
   >> A standard floopy has:   
   >> 80 tracks with 9 sectors of 512 bytes on each side, so it is a total of:   
   >> 80*9*2*512 = 737 280 bytes.   
   >>   
   >> Some sectors are reserved for boot + FAT, so you only get 726 016 bytes   
   >> available for storage.   
   >>   
   >> 738260 - 737280 = 980 bytes added.   
   >> Well, I can't say more in this organisation of those 980 bytes.   
   >>   
   >   
   > It's similar to MS-DOS formatted floppy disks.   
   > You have a boot sector (512 Bytes), which is always not usable for data.   
   > And you have some File Allocation Table sectors, and last but not least a   
   > few sectors for directory entries.   
   > How many sectors are used for FAT and Directory Entries is set by some   
   > bytes/numbers in the mentioned boot sector.   
   >   
   > So this is no rocket science.   
      
   I believe that there are *two* copies of the FAT table, in case one becomes   
   corrupted.   
      
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   |      Charles Richmond       numerist@aquaporin4.com     |   
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