sfdisk가 디스크에 파티션을 쓸 수 없습니다.

내 microSD 카드를 Ubuntu로 부팅할 수 있게 만들려고 합니다. sfdisk파티션을 생성하는데 사용하려고 합니다 . 이 작업을 수행하면 다음과 같은 오류가 발생합니다.

Using sfdisk to create partition layout
-----------------------------
Checking that no-one is using this disk right now ...
OK

Disk /dev/sdb: 30436 cylinders, 64 heads, 32 sectors/track
Old situation:
Warning: The partition table looks like it was made
  for C/H/S=*/255/63 (instead of 30436/64/32).
For this listing I'll assume that geometry.
Units = mebibytes of 1048576 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start   End    MiB    #blocks   Id  System
/dev/sdb1         4  30436- 30433-  31162880    c  W95 FAT32 (LBA)
/dev/sdb2         0      -      0          0    0  Empty
/dev/sdb3         0      -      0          0    0  Empty
/dev/sdb4         0      -      0          0    0  Empty
New situation:
Units = mebibytes of 1048576 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start   End    MiB    #blocks   Id  System
/dev/sdb1   *     1     96     96      98304    e  W95 FAT16 (LBA)
/dev/sdb2         0      -      0          0    0  Empty
/dev/sdb3         0      -      0          0    0  Empty
/dev/sdb4         0      -      0          0    0  Empty
/dev/sdb: Input/output error

sfdisk: Failed writing the partition on /dev/sdb
Re-reading the partition table ...
/dev/sdb: Input/output error
Error closing /dev/sdb
If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
to zero the first 512 bytes:  dd if=/dev/zero of=/dev/foo7 bs=512 count=1
(See fdisk(8).)

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