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Groups > comp.mobile.android > #57000

Re: format on SD card?

From Eli the Bearded <*@eli.users.panix.com>
Newsgroups comp.mobile.android
Subject Re: format on SD card?
Date 2018-10-31 20:51 +0000
Organization Some absurd concept
Message-ID <eli$1810311645@qaz.wtf> (permalink)
References <eli$1810311523@qaz.wtf> <311020181552044921%nospam@nospam.invalid>

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In comp.mobile.android, nospam  <nospam@nospam.invalid> wrote:
> Eli the Bearded <*@eli.users.panix.com> wrote:
>> Can I mount this? What should I be installing?
> tl;dr - no.
> <https://www.androidauthority.com/high-capacity-microsd-cards-android-gary-explains-690710/>
>   Android 6.0 Marshmallow introduced the idea of adopting external
>   storage so that it acts like internal storage. When a microSD card is
>   adopted, it is formatted and encrypted to only work with that device.
>   Now you can safely store both apps and private data on the card. 

Ah, okay.

>> At the same time, I used dd[*] to copy the SD card to a new one of the
>> same size. I put the new one in the device and restarted, and found
>> that Android decided it was a blank disk and reformatted it. How can
>> I duplicate a SD card so that Android is happy with the copy?
> crack the encryption. good luck.

I don't think I should need to crack the encryption to do a block level
copy of one card to another:

>> [*] dd if=/dev/sdb of=/dev/sdc bs=16k iflag=fullblock conf=noerror \
>>  count=$COUNT
>>     where $COUNT is how many 16k blocks fit in 64 gigs.

That copy doesn't rely on understanding the data copied. But it seems to
have *not* copied something that the device was able to use to notice
that the card was different.

Elijah
------
has used dd to copy harddrives to images and mounted those years later

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Thread

format on SD card? Eli the Bearded <*@eli.users.panix.com> - 2018-10-31 19:34 +0000
  Re: format on SD card? nospam <nospam@nospam.invalid> - 2018-10-31 15:52 -0400
    Re: format on SD card? Eli the Bearded <*@eli.users.panix.com> - 2018-10-31 20:51 +0000
      Re: format on SD card? nospam <nospam@nospam.invalid> - 2018-10-31 16:59 -0400
        Re: format on SD card? "Carlos E.R." <robin_listas@es.invalid> - 2018-10-31 22:53 +0100
    Re: format on SD card? "Carlos E.R." <robin_listas@es.invalid> - 2018-10-31 22:59 +0100
  Re: format on SD card? "NY" <me@privacy.net> - 2018-10-31 19:52 +0000
    Re: format on SD card? "Carlos E.R." <robin_listas@es.invalid> - 2018-10-31 22:56 +0100

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