taglinefilesource code
field_valid302drivers/block/hd.cif ((id->field_valid&1) && id->cur_cyls && id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
field_valid1664drivers/block/ide.cif ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
field_valid116include/linux/hdreg.hunsigned short  field_valid;  /* bits 0:cur_ok 1:eide_ok */