kji@vpnet.chi.il.us (Ken Isacson) (04/18/91)
In article <1991Apr13.200405.7276@occrsh.att.com> mjw@occrsh.att.com (Mike_Wood(NAOC307670)) writes: >My documentation is pre-MSDOS 4.0 and am using MS-C 5.1 which doesn't >show how to retrieve the Volume serial number of a diskette formatted >from 4.0 FORMAT command. I am able to get the volume name, via a >C program, but have seen nothing about the serial number. > >Anyone got any ideas? > >I would gladly accept C or assembly source code or just a tip on >the DOS call. It must be portable! > >Thanks > >_______________________________________________ AT&T Network Systems _________ >Oklahoma City 3b2/usr/group >$USR/okc $USR/tulsa >D.P.M.A Member >______________________________________________________________________________ > > "If you can't get ahead, then you're bringing up the rear" > ______ ___ ___ > /| /| ( // (_ | /| // Mike Wood - NAOC307670 > //| //| \__//_// | //| // AT&T Switching Systems > _ // | // | _ ____//__ | // | // Oklahoma City Works > ( |// |// | / ( // | // | // Human Resources IM&M > \// // |/ o \_// o |// |// o att!mwood!mjw attmail!mjw > (405)491-3233 >______________________________________________________________________________ Here is some info that I saved in March... ---------------------------------------------------------------------------- From tellab5!nucsrl!casbah.acns.nwu.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!spool.mu.edu!uunet!abvax!iccgcc!walters Sat Mar 16 10:24:05 CST 1991 Article: 2052 of comp.sys.ibm.pc.misc Xref: vpnet comp.misc:593 comp.sys.ibm.pc.misc:2052 Path: vpnet!tellab5!nucsrl!casbah.acns.nwu.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!spool.mu.edu!uunet!abvax!iccgcc!walters From: walters@iccgcc.decnet.ab.com Newsgroups: comp.misc,comp.sys.ibm.pc.misc Subject: Re: DOS 4.0 Volume Serial Numbers Message-ID: <3632.27d510c4@iccgcc.decnet.ab.com> Date: 6 Mar 91 20:54:42 GMT References: <12818@hubcap.clemson.edu> <1991Mar5.033219.369@nuchat.sccsi.com> Lines: 42 In article <1991Mar5.033219.369@nuchat.sccsi.com>, paul@nuchat.sccsi.com (Paul Hutmacher) writes: > In article <12818@hubcap.clemson.edu> chrisb@hubcap.clemson.edu (Chris Behrens) writes: >>Is there a way to access these ?? Or is there a way to change them ?? > Here is how you get/set the volume serial number. Others have already posted with regard to the serial numbers usefullness. Hope this helps!!!! INT 21 - DOS 4.0 internal AH = 69h AL = subfunction 00h get serial number 01h set serial number BL = drive (0=default, 1=A, 2=B, etc) DS:DX -> disk info (see below) Return: CF set on error AX = error code (see AH=59h) CF clear if successful AX destroyed (AL = 00h) buffer filled with appropriate values from extended BPB (AL = 01h) extended BPB on disk set to values from buffer Notes: does not generate a critical error; all errors are returned in AX error 0005h given if no extended BPB on disk does not work on network drives (error 0001h) buffer after first two bytes is exact copy of bytes 27h thru 3Dh of extended BPB on disk Format of disk info: Offset Size Description 00h WORD info level (zero) 02h DWORD disk serial number (binary) 06h 11 BYTEs volume label or "NO NAME " if none present 11h 8 BYTEs (AL=00h only) filesystem type--string "FAT12 " or "FAT16 " Tom No Sig Yet -- __________________________________________________________ Ken Isacson Sysop - Board Of Trade BBS GT 016/001 kji@vpnet.chi.il.us (815) 753 - 0042 ----------------------------------------------------------