<div dir="ltr"><div dir="ltr"><div>DD is the way to go. BUT if you expended your filesystem to the max of the SD card you will have a large image file for nothing.</div><div><br></div><div>So to do a backup of only the used space you need to do a clever DD command. <br></div><div><br></div><div>first you need to shrink the last partition on the sd card. (I wont tell you how to do it . it is far from the scope of the this message.) but take a look at Gparted. or just Parted if you have no GUI on the machine.<br></div><div><br></div><div>then you go into command line and do: fdisk -l as root (or sudo) <br></div><div><br></div><div>here is the output of one of my PI</div><div><br></div><div>Disk /dev/mmcblk0: 29 GiB, 31117541376 bytes, 60776448 sectors<br>Units: sectors of 1 * 512 = 512 bytes<br>Sector size (logical/physical): 512 bytes / 512 bytes<br>I/O size (minimum/optimal): 512 bytes / 512 bytes<br>Disklabel type: dos<br>Disk identifier: 0xdeb2fbcd<br><br>Device Boot Start End Sectors Size Id Type<br>/dev/mmcblk0p1 8192 96453 88262 43.1M c W95 FAT32 (LBA)<br>/dev/mmcblk0p2 98304 60776447 60678144 29G 83 Linux</div><div><br></div><div><br></div><div>From there you need 2 info the block size (512 in my case) and the last used sector number. (
60776447 for that exemple) <br></div><div><br></div><div>you then use that command:</div><div><br></div><div>DD if="your source device" of =" your destination" bs=512 count=60776448 <br></div><div><br></div><div>that would extract the image file and it would stop 1 block more then the used size of the last partition.</div><div><br></div><div>that way the image will be the exact maximum size it need to and if you then use another SD card that dont have exactly the same size as the original you wont run into problem copying it.</div><div><br></div><div><br>
</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le mer. 13 mars 2019 à 15:30, Bret Taylor <<a href="mailto:bmtaylor@osd.wednet.edu">bmtaylor@osd.wednet.edu</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div dir="auto">You dd from one disk to another. You want to write the "image" of your source to the destination disk. That will give you an exact copy.</div></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 13, 2019 at 12:24 PM Lu V <<a href="mailto:luvencl8@gmail.com" target="_blank">luvencl8@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Yea I am about to do the same (dd) but I see two partitions pop up when I plug in the SD card . Which do you back up? Or is my w10 doing something odd? <br>
<br>
Sent from my iPhone, Lu Vencl<br>
<br>
> On Mar 13, 2019, at 3:02 PM, Jason <<a href="mailto:cturning1@gmail.com" target="_blank">cturning1@gmail.com</a>> wrote:<br>
> <br>
> I just struggled to use the win32diskimager to duplicate my Allstar card. It's not intuitive, so what worked for me was you have to set the destination file first, then it will let you read the SD card. Then when done you can write to a new card. I almost jumped over to my Linux laptop for dd. <br>
> <br>
> Jason - N6WBL<br>
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</blockquote></div></div>-- <br><div dir="ltr" class="gmail-m_-3888941583786160786gmail_signature"><div dir="ltr">--Bret Taylor<div>Olympia School District</div></div></div>
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