write_disk
static ssize_t write_disk(daddr_t, void *);
if (write_disk(0, &mboot) == -1) {
if (write_disk(i / 0x200, &bootcode[i / 0x200]) == -1) {
if (write_disk(ext.base + offset, ext.ptn + i) == -1) {
if (write_disk(gptp->hdr_lba_self, hdr) == -1) {