SDHC date lose,help!help~!

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It's installed Debian Sid which is my SDHC.When i run "apt-get
dist-upgrade",in this time power off. when i poweron ,i see my SDHC is
borcken.

now i run -> #fdisk /dev/sdb               show:Unable to read /dev/sdb
                  #gpart /dev/sdb               show:*** Fatal error:
cannot
get sector size on dev(/dev/sdb)
                  #gpart /dev/sdb -s 63       show:*** Fatal error: failed
trying to use sector size 63.
                  #cat /dev/sdb | less         show:cat: /dev/sdb:  io
error

who can help me!!!!~~~~

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<div dir="ltr">It&#39;s installed Debian Sid which is my SDHC.When i run
&quot;apt-get dist-upgrade&quot;,in this time power off. when i poweron ,i
see my SDHC is borcken.<br><br>now i run -&gt; #fdisk
/dev/sdb&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
show:Unable to read /dev/sdb<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;
&nbsp;&nbsp; #gpart
/dev/sdb&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
show:*** Fatal error: cannot get sector size on
dev(/dev/sdb)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
#gpart /dev/sdb -s 63&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; show:*** Fatal
error: failed trying to use sector size 63.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
#cat /dev/sdb | less&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
show:cat: /dev/sdb:&nbsp; io error<br><br>who can help me!!!!~~~~<br>
</div>

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