Re: disk size detection

 BBS: Inland Empire Archive
Date: 01-07-93 (07:50)             Number: 346
From: FRANCOIS ROY                 Refer#: NONE
  To: STEVE PERRY                   Recvd: NO  
Subj: Re: disk size detection        Conf: (2) Quik_Bas

 SP> Does anyone have an easy way to detect whether the disk in the drive is
 SP> a low density or if it's a high density?

 There has been code floating around to give you free space left on a disk.
 The same function call returns total disk space available.  Simply test that
 value to see if it is greater than, say, 800000.  If it is, it's a
 high-density 5.25in or 3.5in; if not, it's low density.  Here is my version
 of that free space code:

  REM Gets freespace & total formatted space on the Default drive
  TYPE REGTYPE  ' For CALL INTERRUPT
    AX AS INTEGER
    BX AS INTEGER
    CX AS INTEGER
    DX AS INTEGER
    BP AS INTEGER
    SI AS INTEGER
    DI AS INTEGER
    FL AS INTEGER
    DS AS INTEGER
    ES AS INTEGER
  END TYPE
  DIM INR AS REGTYPE, OUR AS REGTYPE
  INR.AX = &H3600   ' INR.DX can contain a drive designator
                    ' (0=default, 1=A:,2=B:, ...)
  CALL INTERRUPT(&H21, INR, OUR)
  A& = OUR.AX: B& = OUR.BX: C& = OUR.CX: D& = OUR.DX
  PRINT D& * C& * A&; "bytes total,"; B& * C& * A&; "free."

  Large partitions (like my 330Mb 'C:' drive) sometimes return a negative
  value for the total free space... these problems did not exist in the days
  of 32Mb max. size partitions.  Guess I'll have to review the above code
  some day.

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 * Origin: Out of String Space - the Final Frontier (Fidonet 1:163/506.2)