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Format of current directory structure (CDS) (array, LASTDRIVE entries)

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Offset Size Description

00h

67 BYTEs

ASCIZ path in form X:\PATH (local) or UNC form \\SERVER\PATH (network, see notes below)

43h

WORD

drive attributes (also see note below) (see also AX=5F07h)
bit 15 : uses network redirector

invalid if 00, installable file system if 11
bit 14 : physical drive
bit 13 : JOIN'ed

path above is true path that would be needed if not under SUBST or JOIN
bit 12 : SUBST'ed
bit 11 : removable media (WinNT4.0)
bit 10 : hard disk??? (WinNT4.0)
bit 7 : remote drive hidden from redirector's assign-list and exempt from network connection make/break commands; set for CD-ROM drives by MSCDEX (not supported by CORELCDX)

45h

DWORD

pointer to Drive Parameter Block for drive (see #01395 at AH=32h)

---local drives---

49h

WORD

starting cluster of current directory
0000h = root
FFFFh = never accessed

4Bh

WORD

??? seems to be FFFFh always

4Dh

WORD

??? seems to be FFFFh always

---network drives---

49h

DWORD

pointer to redirector or REDIRIFS record, or FFFFh:FFFFh (DOS 4 only) available for use by IFS driver

4Dh

WORD

stored user data from INT 21/AX=5F03h

------

4Fh

WORD

offset in current directory path of backslash corresponding to root directory for drive
this value specifies how many characters to hide from the "CHDIR" and "GETDIR" calls; normally set to 2 to hide the drive letter and colon, SUBST, JOIN, and networks change it so that only the appropriate portion of the true path is visible to the user

---DOS 4.0+ ---

51h

BYTE

(DOS 4 only, remote drives) device type
04h network drive

52h

DWORD

pointer to IFS driver (DOS 4) or redirector block (DOS 5+) for this drive, 00000000h if native DOS

56h

WORD

available for use by IFS driver

Note:

The path for invalid drives is normally set to X:\, but may be empty after JOIN x: /D in DR DOS 5.0 or NET USE x: /D in older LAN versions.
Normally, only one of bits 13&12 may be set together with bit 14, but DR DOS 5.0 uses other combinations for bits 15-12: 0111 JOIN, 0001 SUBST, 0101 ASSIGN (see #01644).
Windows for Workgroups 3.11 network sets the path to the local drive and directory even for network drives; in that case the UNC form \\SERVER\SHARE can be obtained with INT 21/AX=5F02h or INT 21/AX=5F46h. LapLink RemoteAccess does the same even for INT 21/AX=5F02h.
Window NT 4.0 always uses X:\PATH, even for substituted drives (i.e. the CDS will *not* contain the original path prior to SUBST).
SoftWindows on the Macintosh PowerPC sets \\E for the host drive.

See Also:

#01644,INT 21/AX=71AAh/BL=00h