<div dir="ltr"><div>This is most likely what it is:</div><a href="http://www.sandisk.com/about-sandisk/press-room/press-releases/2010/2010-12-20-sandisk-secure-flash-memory-technology-to-power-new-cricket-unlimited-%E2%80%9Cmuve-music%E2%80%9D-wireless-service/">http://www.sandisk.com/about-sandisk/press-room/press-releases/2010/2010-12-20-sandisk-secure-flash-memory-technology-to-power-new-cricket-unlimited-%E2%80%9Cmuve-music%E2%80%9D-wireless-service/</a><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jul 7, 2015 at 2:13 PM, C M Reinehr via Linux-users <span dir="ltr"><<a href="mailto:linux-users@linux-sxs.org" target="_blank">linux-users@linux-sxs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div style="font-family:'DejaVu Sans Mono';font-size:11pt;font-weight:400;font-style:normal"><span class="">
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">On Sunday, July 05, 2015 05:44:15 PM Lonni J Friedman via Linux-users wrote:</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> I've got a weird one here.  A microSD card which came with a junky old</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> Android phone claims to be 4GB on its label, however there's some</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> weird marketing nonsense about how "3GB reserved for music".  When I</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> plug the card into a reader attached to a linux box, its always</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> detected as a 1GB card:</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> [3181684.541224] scsi 10:0:0:0: Direct-Access     Generic  STORAGE</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> DEVICE   0207 PQ: 0 ANSI: 0</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> [3181684.541593] sd 10:0:0:0: Attached scsi generic sg7 type 0</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> [3181685.004787] sd 10:0:0:0: [sdg] 1934848 512-byte logical blocks:</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> (990 MB/944 MiB)</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> I'm guessing that there's something weird going on with the card that</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> hides 3GB from the OS somehow.  Has anyone run into this before?  Any</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> tips on how to unhide the missing 3GB?</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> thanks</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
</span><p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">I believe that this Wikipedia article may provide a clue:</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><a href="https://en.wikipedia.org/wiki/Secure_Digital#Storage_capacity_and_incompatibilities" target="_blank">https://en.wikipedia.org/wiki/Secure_Digital#Storage_capacity_and_incompatibilities</a></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Per the article, a host o/s determines the capacity of an SD card by interogating the card for it's Card-Specific Data identification string. The article goes into some detail about the format of this string and different versions, but the important part is that the o/s knows the size of the card based upon the card provided CSD. In this case, I believe that the card intentionally is misreporting the size of the card.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">HTH.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">CMR</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">-- </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">“Three millions of people, armed in the holy cause of liberty, and in such a country as that which we possess, are invincible by any force which our enemy can send against us. Beside, sir, we shall not fight our battles alone. There is a just God who presides over the destinies of Nations, and who will raise up friends to fight our battles for us. The battle, sir, is not to the strong alone; it is to the vigilant, the active, the brave.” -- Patrick Henry</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">--------</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p></div><br>_______________________________________________<br>
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<br></blockquote></div><br></div>