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struct DPBType {
char drive ; /* physical drive number */
char unit ; /* unit within device */
unsigned cbSector ; /* bytes per sector */
char mask ; /* sectors/alloc unit - 1 */
char shift ; /* bit to shift */
unsigned secFAT ; /* sector number of first FAT */
char cFAT ; /* count of FATs */
unsigned cDirEnt ; /* count of root directory entries */
unsigned secData ; /* first data sector */
unsigned cCluster ; /* max number of clusters on drive */
unsigned csecFAT ; /* sectors in each FAT */
unsigned secDir ; /* first sector of root dir */
long pDevice ; /* pointer to device header */
char media ; /* last media in drive */
char fFirst ; /* TRUE => media check needed */
long nextDPB ; /* pointer to next dpb */
unsigned clusFree ; /* cluster number of last alloc */
unsigned FreeCnt ; /* count of free clusters, -1 if unk */
/* char SyncFlg ; /* sync flags, (see below) */
} ;
/* Definitions of SyncFlg values from DPB.INC */
#define DPB_ABUSY 1 /* some process is allocating clusters */
#define DPB_AWANT 2 /* some process waiting to allocate */
#define DPB_FBUSY 4 /* some process is reading FAT */
#define DPB_FWANT 8 /* some process waiting to read FAT */
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