sectorHdr_t
sectorHdr_t *shdr;
sectorHdr_t *shdr;
sectorHdr_t hdr;
sectorHdr_t hdr;
sectorHdr_t sHdr; /* current sector header */
int iwmReadSector(sectorHdr_t *, cylCacheSlot_t *, void *);
int iwmWriteSector(sectorHdr_t *, cylCacheSlot_t *);
int iwmReadSectHdr(sectorHdr_t *);