Question Dumping SX OS Emunand partition

Discussion in 'Switch - Exploits, Custom Firmwares & Soft Mods' started by nachuz, Mar 7, 2019.

  1. nachuz
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    nachuz GBAtemp Advanced Fan

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    So I updated my emunand to 7.0.0 due to nobody telling that updating via local wireless updates the system too and since I don't have tickets from nsps installed on the emunand on my sysnand and my saves are on the emunand, I want to backup the emunand, restore it on sysnand and switch to Atmosphere because SX OS doesn't seem to update anytime soon (and Atmosphere is better anyways, I don't care about $25 spent one year ago)
    The problem is that the SX payload doesn't let you backup your emunand and as far as I know, there's no software to backup your emunand on another partition, so how I do that, I'm fucked up for using fucking SX?
     
  2. Idontknowwhattoputhere

    Idontknowwhattoputhere See i would put something here if i knew what to

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    Use win32 disk imager to img your sd to dump it
     
  3. nachuz
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    nachuz GBAtemp Advanced Fan

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    and what I'm supossed to do then? I'm not going to switch the microSD, I want to have the emunand to install it into the sysnand, not get a img of my whole microSD card
     
  4. Idontknowwhattoputhere

    Idontknowwhattoputhere See i would put something here if i knew what to

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    it imgs the whole sd card partition so the sx emunand hidden partition will be there
     
  5. Milenko
    This message by Milenko has been removed from public view by gamesquest1, Mar 7, 2019, Reason: silly Milenko.
    Mar 7, 2019
  6. nachuz
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    nachuz GBAtemp Advanced Fan

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    and how I get the nand from it
     
  7. thaikhoa

    thaikhoa GBAtemp Addict

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    Backup
    Restore
     
  8. Idontknowwhattoputhere

    Idontknowwhattoputhere See i would put something here if i knew what to

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    ffs its in the dump
     
  9. nachuz
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    nachuz GBAtemp Advanced Fan

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    when I use it, it says that "/dev/disks" doesn't exist
     
  10. josete2k

    josete2k GBAtemp Fan

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  11. thaikhoa

    thaikhoa GBAtemp Addict

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    Check on the physical address where is the location of your sd.
     
  12. gizmomelb

    gizmomelb GBAtemp Advanced Fan

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    old post, but following up since nachuz is still whining about emuNAND in other threads - this is how you extract the hidden partition emuNAND and convert it to files.

    I highly recommend to ALL SX OS users that use emuNAND to use it as files on SD, not the hidden partition. Makes it easier to backup, you can edit it with hacdisk etc.

    https://gbatemp.net/posts/8602506
     
  13. josete2k

    josete2k GBAtemp Fan

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    But when your sd becomes corrupt your emunand could be too...
     
  14. gizmomelb

    gizmomelb GBAtemp Advanced Fan

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    while it is possible it is also as possible for hidden partition to become corrupt. FAT32 at least has some ''protection'' to file allocation tables due to two copies of it on the storage media, EXFAT corrupts more easily due to it only having one file allocation table - so if that corrupts, goodbye all data.

    my personal obervation - I have less errors from coming out of sleep more since I have converted to SD files, than what I had when running a hidden partition emuNAND.

    But everyone may have different experiences.
     
    Last edited by gizmomelb, Apr 29, 2019
  15. xs4all

    xs4all GBAtemp Fan

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    Yes this is true, think of it this way, what if you want to backup your EmuNand?

    EmuNand as files on microSD <= Copying your EmuNand files is quick, fast and easy.
    EmuNand as hidden partition <= Very slow using DD method.

    If your using a minimum 64GB SD CARD and combined that with a USB3 card reader, the transfer speeds are pretty fast if you want to make backup of your EmuNand.
    Try to do the same backup using DD command for EmuNand as hidden partition, since it's doing a raw backup, it takes ages!

    Touch wood I haven't had any SD CARD corruptions but I'm one of those that prefer EmuNand as files on microSD over EmuaNand as hidden partition for backup purposes.
     
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  16. josete2k

    josete2k GBAtemp Fan

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    I made a backup with DD in 2 hours... Not bad.

    Restoring is faster... Around 45 minutes because I use a bigger block size.
     
  17. xs4all

    xs4all GBAtemp Fan

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    I was going to ask how long it takes on average to backup using DD? Your 2 hours seems to be quicker than me.

    I've tried on a couple different laptops with built in SD CARD readers and also USB card readers and I followed your detailed guide on that Spanish site that you posted. For some reason the backup process was very slow, nothing like your 2 hours completion time, from memory it took me more that 8 hours to complete to backup using DD.
    Restore is roughly the same as yours, anything I should know about the DD backup process? I pretty much followed all the steps to backup, but still slow, that is why in my previous reply I said it was slow, but maybe slow only for me?
     
  18. josete2k

    josete2k GBAtemp Fan

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  19. xs4all

    xs4all GBAtemp Fan

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    Interesting, with this adapter, are you still using the bs=1024 when dumping in the dd command?

    I managed to find a few more SD CARD readers lying around, I did a test of dumping for about 1 minute, in that 1 minute, with all my readers, I manage to find a reader that dumps roughy about 80mb per minute, all the other readers I have dumps at around 50mb per minute.

    So it works out, the reader that was the fastest that I had will take roughly 6 hours to fully dump the 29.1GB rawnand, while the slower ones take about 9.7 hours to fully dump the 29.1GB rawnand. The 9.7 hours which it took to backup my hidden emunand backup a few weeks back sounds about right.

    So the SD CARD reader does play a role as to how fast it dumps the rawnand from hidden EmuNand partition, does changing the bs=1024 when dumping makes a difference? I did a test with bs=1M and 5M and the backup speeds was pretty fast, but I assume this will mess up the dumping process of the rawnand?
     
    Last edited by xs4all, May 8, 2019
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  20. Garou

    Garou GBAtemp Maniac

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    pretty sure it will
    because the skip parameter used in dd means skipping data based on the block size. so if you're using bs=1M then the starting offset of your dumped data will change too
     
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  21. xs4all

    xs4all GBAtemp Fan

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    Thanks for the reply, I had a suspicion this was the case regarding the skip parameter command.
     
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