MAX_REBUILD_SECTORS
buffer = malloc(SECTOR_TO_BYTE(MAX_REBUILD_SECTORS), M_DEVBUF, M_NOWAIT);
pCmd->uCmd.R1Control.nSectors = MAX_REBUILD_SECTORS;
pCmd->uCmd.R1Control.nSectors = MAX_REBUILD_SECTORS/2;
pCmd->uCmd.R1Control.nSectors = MAX_REBUILD_SECTORS;