BLK_CUR_BLKLIST
BLK_CUR_BLKLIST = BLK_BLKLIST_START;
BLK_CUR_BLKLIST = BLK_BLKLIST_START;
if (BLK_CUR_BLKNUM >= BLK_BLKLENGTH (BLK_CUR_BLKLIST))
BLK_CUR_BLKLIST += BLK_BLKLIST_INC_VAL;
size = ((BLK_BLKLENGTH (BLK_CUR_BLKLIST) - BLK_CUR_BLKNUM)
devread (BLK_BLKSTART (BLK_CUR_BLKLIST) + BLK_CUR_BLKNUM,