问个小问题

block 1336 is bad
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
Partially written block 81 detected
yaffs_read_super: isCheckpointed 0
VFS: Mounted root (yaffs filesystem) on device 31:2.
Freeing init memory: 112K

Please press Enter to activate this console.
这里面Partially written block 81 detected是什么意思

当开发板直接关机，而没有使用类似于reboot的命令时，yaffs就会记住是非正常关机，然后下次启动时提示这个信息。