On Mon, Dec 09, 2019 at 10:45:46PM +0100, Antony Stone wrote: > On Monday 09 December 2019 at 22:38:26, Hendrik Boom wrote: > > > I have an sd card that used to be in an android phone. > > My usual tools tell me very little: > > > > root@midwinter:~# lsblk --fs /dev/sdb > > NAME FSTYPE LABEL UUID MOUNTPOINT > > sdb > > ├─sdb1 > > └─sdb2 > > > > root@midwinter:~# fdisk -l /dev/sdb > > Disk /dev/sdb: 14.9 GiB, 15931539456 bytes, 31116288 sectors > > Units: sectors of 1 * 512 = 512 bytes > > Sector size (logical/physical): 512 bytes / 512 bytes > > I/O size (minimum/optimal): 512 bytes / 512 bytes > > Disklabel type: gpt > > Disk identifier: 4F1502F0-81F3-49FA-A294-8B8FB4DB6964 > > I'm really rather surprised that a 16Gbyte SD card is has a GPT partition > table.
My guess is that Android put it there and that it's not what was on it originally. > > > Device Start End Sectors Size Type > > /dev/sdb1 2048 34815 32768 16M unknown > > /dev/sdb2 34816 31116254 31081439 14.8G unknown > > root@midwinter:~# > > > > Is there another way to find out anything? > > Well, given that it's got a GPT partition table, try sgdisk instead of sfdisk. > > > Or is this likely to be an Google-encrypted card I can do nothing with > > except restore it to an almost virginal state? > > What do you *want* to do with it? > > Read it, copy it, reformat it, what? Read it if I can (and I aready suspect I can't); otherwise reformat it to whatever file system it is that most consumer devices using microsd cards expect. Kind of a factory reset. > > > And what is the proper way to reformat an sdcard to the file > > systems just about everything accepts without using > > up its remaining lifetime? > > Hm, dd if=/dev/zero of=/dev/sdb bs=1M count=1 Yes, that will clear it out. But what file system is customarily on a new 16G microsd card? And does that fs really need everything cleared out? -- hendrik _______________________________________________ Dng mailing list [email protected] https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
