SBCOUNT
if ((n + size) < (SBSIZE * SBCOUNT))
(SBCOUNT*SBCOUNT));
static u_int8_t buf[SBSIZE * SBCOUNT];
for (blk = beg; blk <= ((end<0)?blk:end); blk += (SBCOUNT*SBSIZE/512)){
memset(buf, 0, SBSIZE * SBCOUNT);
if (read(fd, buf, SBSIZE * SBCOUNT) == -1)
for (n = 0; n < (SBSIZE * SBCOUNT); n += 512){