format on SD card?

From	Eli the Bearded <*@eli.users.panix.com>
Newsgroups	comp.mobile.android
Subject	format on SD card?
Date	2018-10-31 19:34 +0000
Organization	Some absurd concept
Message-ID	<eli$1810311523@qaz.wtf> (permalink)

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I put an SD card into one of my android devices (6.0) and let the
system format it as native or whatever the system calls it. This
worked fine. 

Later I shut the device down, pulled the SD card out and tried to
mount it on Linux. Surprise, the format isn't recognized out of the
box and 'file -s' isn't giving me hints about the filesystem type.
Can I mount this? What should I be installing?

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?

[*] 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.

This whole exercise was prompted by the original SD card starting to
give me errors.

Elijah
------
has a separate backup of the files as seen from userspace

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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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