IBM External Submission #24749
“Reprint Courtesy of International Business Machines Corporation, © International Business Machines Corporation”
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Long DosOpen hangs process that invoked the DosOpen (72417)

       PTDA to TCB
       - RetryCount
       - Share Retries Left
       - Retry Loop
       - DirStart
       - DirSec
       - NxtClusNum

       Removed
       - EnterFSCrit
       - ExitFSCrit

Reserve Drive Letter Support (150144)

       Syntax
       - RESERVEDRIVELETTER=x       where 'x' is a letter D - Z
       - Example: User has 2 local disk paritions, C: and D: 
                  and a CD ROM, F:    
         place the following in the CONFIG.SYS:   RESERVEDRIVELETTER=E

Performance: Optimize FAT Read-ahead  (158238)

       Read more sectors per bytes being read

                     Old    New
          32 -  512    8     64
         513 - 4096   16     64
        4097 - 8192   32    128

Performance: Don't allocate FAT Cache if no FAT paritions exist  (159608)
 
