IoctlDriveInfoRec

 DOS Fn 4409H (is drive remote) returns this layout in DX.

IoctlDriveInfoRec ─── layout when describing a local drive
 1 1 1 1 1 1
╓5┬4┬3┬2┬1┬0┬9┬8╥7┬6┬5┬4┬3┬2┬1┬0╖
║s│i│f│0│r│0│l│0║q│g│0 0 0 0 0│a║
╙╥┴╥┴╥┴─┴╥┴─┴╥┴─╨╥┴╥┴─┴─┴─┴─┴─┴╥╜ bit  mask
 ║ ║ ║   ║   ║   ║ ║           ╚═► 0: 0001H uses 32-bit addressing
 ║ ║ ║   ║   ║   ║ ╚═════════════► 6: 0040H suprts generic Blk IOCTL  440dH
 ║ ║ ║   ║   ║   ║                          and get logical drive map 440eH
 ║ ║ ║   ║   ║   ║                          and set logical drive map 440fH
 ║ ║ ║   ║   ║   ╚═══════════════► 7: 0080H suprts query IOCTL suprt  4411H
 ║ ║ ║   ║   ╚═══════════════════► 9: 0100H this local drive is shared
 ║ ║ ║   ╚═══════════════════════►11: 0800H supports Is Media Rmvbl   4408H
 ║ ║ ╚═══════════════════════════►13: 2000H Needs FAT with BPB     DvRq 02H
 ║ ╚═════════════════════════════►14: 4000H supports IOCTL Read       4404H
 ║                                          and IOCTL Write           4405H
 ╚═══════════════════════════════►15: 8000H 1=this is a Subst drive

See Also: fn 4409H (IOCTL is drive remote)
          Device Attribute
          Device Drivers
          DOS Functions
                                    -♦-