From: jj4public@gmail.com   
      
   On Mon, 18 Apr 2022 11:16:19 -0700 (PDT), muta...@gmail.com wrote:   
   >   
   > What is the logic behind choosing a sector size?   
   > Could they have chosen a sector size of 1 byte?   
   > Or 4096 right from the start?   
   >   
   > Also, is the switch from 512 to 4096 being done   
   > purely because they are exceeding the 32-bit   
   > sector number? Previously when they were using   
   > CHS addressing, basically 24-bit, they switched to   
   > LBA to get the 32 bits. But why not make an   
   > LBA-enhanced that is 64 bits?   
   >   
   > Thanks. Paul.   
      
   A sector consist not just user data area, but also identification marker,   
   address, synchronization marker, and gaps - which also consume space on the   
   physical media. See Int 1Eh Diskette Parameter table. More details can be   
   found in IBM PC Technical Reference document.   
      
   Having too small sector size increases the space required for those data.   
   It'd be kind of like overhead of a file system, but in this case, a disk's   
   sector layout within a track.   
      
   The unformatted capacity of a floppy disk is the raw capacity before being   
   used for those formatting data - which is quite larger than the formatted   
   one. e.g. 2MB unformatted for 1.44MB format.   
      
   Custom high capacity floppy disk formats such as 2M/3M, Microsoft DMF, and   
   IBM XDF, shrink the gap lengths to make room for additional sectors. IBM XDF   
   mixes sector sizes in the same track.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)