kp51 sdhc transmission errors

Nokia-N900:~# dd if=/dev/zero of=/dev/mmcblk1
dd: writing '/dev/mmcblk1': Input/output error
51929+0 records in
51928+0 records out
Nokia-N900:~# dmesg
 50096
[ 2955.269256] end_request: I/O error, dev mmcblk0, sector 50104
[ 2955.269287] end_request: I/O error, dev mmcblk0, sector 50112
[ 2955.269287] end_request: I/O error, dev mmcblk0, sector 50120
[ 2955.269317] end_request: I/O error, dev mmcblk0, sector 50128
[ 2955.269348] end_request: I/O error, dev mmcblk0, sector 50136
[ 2955.269378] end_request: I/O error, dev mmcblk0, sector 50144
[ 2955.269378] end_request: I/O error, dev mmcblk0, sector 50152
[ 2955.269409] end_request: I/O error, dev mmcblk0, sector 50160
[ 2955.269439] end_request: I/O error, dev mmcblk0, sector 50168
[ 2955.269439] end_request: I/O error, dev mmcblk0, sector 50176
[ 2955.269470] end_request: I/O error, dev mmcblk0, sector 50184
[ 2955.269500] end_request: I/O error, dev mmcblk0, sector 50192
[ 2955.269500] end_request: I/O error, dev mmcblk0, sector 50200
[ 2955.269531] end_request: I/O error, dev mmcblk0, sector 50208
[ 2955.269561] end_request: I/O error, dev mmcblk0, sector 50216
[ 2955.269561] end_request: I/O error, dev mmcblk0, sector 50224
[ 2955.269592] end_request: I/O error, dev mmcblk0, sector 50232
[ 2955.269622] end_request: I/O error, dev mmcblk0, sector 50240
[ 2955.269622] end_request: I/O error, dev mmcblk0, sector 50248
[ 2955.269653] end_request: I/O error, dev mmcblk0, sector 50256
[ 2955.269683] end_request: I/O error, dev mmcblk0, sector 50264
[ 2955.269683] end_request: I/O error, dev mmcblk0, sector 50272
[ 2955.269714] end_request: I/O error, dev mmcblk0, sector 50280
[ 2955.269714] end_request: I/O error, dev mmcblk0, sector 50288
[ 2955.269744] end_request: I/O error, dev mmcblk0, sector 50296
[ 2955.269775] end_request: I/O error, dev mmcblk0, sector 50304
[ 2955.269775] end_request: I/O error, dev mmcblk0, sector 50312
[ 2955.269805] end_request: I/O error, dev mmcblk0, sector 50320
[ 2955.269836] end_request: I/O error, dev mmcblk0, sector 50328
[ 2955.269836] end_request: I/O error, dev mmcblk0, sector 50336
[ 2955.269866] end_request: I/O error, dev mmcblk0, sector 50344
[ 2955.269866] end_request: I/O error, dev mmcblk0, sector 50352
[ 2955.279266] mmcblk0: error -110 sending status comand<3>mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
[ 2955.279296] mmcblk0: error -110 transferring data, sector 50360, nr 1024, card status 0x0
[ 2955.279357] mmcblk0: error -110 requesting status
[ 2955.279388] end_request: I/O error, dev mmcblk0, sector 50360