SD卡挂载出错

插入SD卡，检测到了，信息如下：
mmc0: new SD card at address 0007
mmcblk0: mmc0:0007 SD02G 1.90 GiB
mmcblk0: p1
但是挂载的时候出现错误了，信息如下：
# mount -t auto -o sync,noatime /dev/mmcblk0p1 /mnt/mmc/
mmcblk0: error -84 transferring data, sector 247, nr 1, card status 0x900
end_request: I/O error, dev mmcblk0, sector 247
FAT: unable to read boot sector
mmcblk0: error -84 transferring data, sector 247, nr 1, card status 0x900
end_request: I/O error, dev mmcblk0, sector 247
FAT: unable to read boot sector
mmcblk0: error -84 transferring data, sector 247, nr 1, card status 0x900
end_request: I/O error, dev mmcblk0, sector 247
FAT: unable to read boot sector
mount: mounting /dev/mmcblk0p1 on /mnt/mmc/ failed: Input/output error
#
这个是哪里出问题了？