Clear eMMC on SG-2440 with SSD installed



  • I am acquiring a pre-owned SG-2440 to try. I want to have the device fresh, just like it came out of the factory. It has a SSD which should be easy enough to install pfSense on, and I'm aware that during installation the SSD will be cleared. So, that part is handled. However, I want to be sure that the eMMC in the device is also cleared in case anything may have been installed there at one point and I'm not sure how to do that.

    Can someone walk me through the commands to erase the eMMC? I'm assuming it would be easiest to enter commands from the serial console or maybe just dropt to a command prompt from the Web GUI? Or, if this is not the best way, please make suggestions.

    Thanks,
    Adam



  • if your device came with factory installed pfSense, eMMC is already clear, pfSense is installed on SSD.



  • @NineX:

    if your device came with factory installed pfSense, eMMC is already clear, pfSense is installed on SSD.

    If you wish to clean device it's quite simle
    boot pfsense installer from usb stick
    and install (it will install on ssd by default)

    reboot

    enable ssh on new instalation
    log in via ssh
    shell

    verify if there are partitions on eMMC:

    gpart list da0

    if you get an error like:

    gpart: No such geom: da0.

    mean you havve clean eMMC , no need any actions.

    otherwise run:

    gpart delete -i 3 da0
    gpart delete -i 2 da0
    gpart delete -i 1 da0
    gpart destroy -F da0

    reboot

    now you have fresh install of pfsense on ssd , and totally clean emmc



  • Thanks for the reply.

    I'm not sure if SSD was factory or added so this is helpful.

    pfSense is currently installed, though my intention is to do a fresh install. I assume I can just pick up from the ssh steps in your instructions? However, I'm not sure what you mean by "enable ssh" and "log in via ssh". I can go through the serial console or from the web GUI, can you be a little more specific please?
    Thanks again,
    Adam



  • @NineX:

    @NineX:

    if your device came with factory installed pfSense, eMMC is already clear, pfSense is installed on SSD.

    If you wish to clean device it's quite simle
    boot pfsense installer from usb stick
    and install (it will install on ssd by default)

    reboot

    enable ssh on new instalation
    log in via ssh
    shell

    verify if there are partitions on eMMC:

    gpart list da0

    if you get an error like:

    gpart: No such geom: da0.

    mean you havve clean eMMC , no need any actions.

    otherwise run:

    gpart delete -i 3 da0
    gpart delete -i 2 da0
    gpart delete -i 1 da0
    gpart destroy -F da0

    reboot

    now you have fresh install of pfsense on ssd , and totally clean emmc

    I wasn't sure about the SSH (still not), so I logged in through the web GUI and ran the commands through Diagnostics>Command Prompt in the Execute Shell Command section.

    gpart list da0 = listed a bunch of disk information
    gpart delete -i 3 da0 = did not find anything
    gpart delete -i 2 da0 = did not find anything
    gpart delete -i 1 da0 = deleted successful
    gpart destroy -F da0 = destroyed successful

    Then I ran gpart list da0 again and received gpart: No such geom: da0. back as a reply.

    So now my question is, if running gpart list da0 and receiving gpart: No such geom: da0. as a reply is a verification that the eMMC is wiped clean?

    Thanks again,

    Adam


  • Rebel Alliance Developer Netgate

    You can certainly use gpart to work with partitions but if you want to ensure a drive is completely wiped, the most certain way is with dd.

    dd if=/dev/zero of=/dev/da0 bs=1m
    


  • @jimp:

    You can certainly use gpart to work with partitions but if you want to ensure a drive is completely wiped, the most certain way is with dd.

    dd if=/dev/zero of=/dev/da0 bs=1m
    

    Thank you!
    Can I run this from the GUI command prompt execute shell?
    What should I see for a response and/or how do I verify it is wiped?
    Thanks again,
    Adam


  • Rebel Alliance Developer Netgate

    I wouldn't run it from the GUI, run it from a shell prompt over ssh or the console.

    At the end it will output the total amount written. If it doesn't show any errors and the total is about the same size as the disk, then it worked.



  • Excellent- thank you!



  • @A.Bursell:

    Excellent- thank you!

    Finally got around to trying this from console>shell

    The response I received is

    dd: /dev/da0: Operation not supported

    I don't know anything about this command to know what might be wrong or why it might have given me this message.

    Help?

    Thanks!



  • @A.Bursell:

    @A.Bursell:

    Excellent- thank you!

    Finally got around to trying this from console>shell

    The response I received is

    dd: /dev/da0: Operation not supported

    I don't know anything about this command to know what might be wrong or why it might have given me this message.

    Help?

    Thanks!

    did you reboot after gpart destroy?



  • @NineX:

    @A.Bursell:

    @A.Bursell:

    Excellent- thank you!

    Finally got around to trying this from console>shell

    The response I received is

    dd: /dev/da0: Operation not supported

    I don't know anything about this command to know what might be wrong or why it might have given me this message.

    Help?

    Thanks!

    did you reboot after gpart destroy?

    I'm 99.9% sure that I did but it's been several days do I really don't remember. Just for clarification the first set of commands suggested in here I followed but per Jimp's suggestion I wanted to try another and that's where I ran into potential trouble. I really don't know anything about these commands. Maybe the eMMC is already cleared and just a command to view free space would be all that I need now? I just wanted to clear it so it's just like it left the factory is all.



  • Ok, so I made a bonehead move and realized I was actually into the console on the wrong device (more than one connected to this PC so I can play with them). Anyway, I got into the correct one and re-ran the commands. Same results on the gpart commands. When using dd I was finally rewarded with:

    [2.4.0-RELEASE][root@pfSense.localdomain]/root: dd if=/dev/zero of=/dev/da0 bs=1m
    dd: /dev/da0: end of device
    3649+0 records in
    3648+0 records out
    3825205248 bytes transferred in 310.579761 secs (12316338 bytes/sec)
    [2.4.0-RELEASE][root@pfSense.localdomain]/root:

    Total ends up pretty close to 4gb. I would say that is a success!

    Thank you!

    Adam


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