How to format SD card that has been formatted as internal storage for Android?

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1

My SD card was formatted as internal storage for Android 6.0 and it was working fine. I mounted my SD card on my second Android phone and format it as external storage but again it said “Unsupported SD card”.  So I mounted my SD card on my PC and I tried to format it using Windows 10 but it failed (“Windows was unable to complete the format”). I have tried clean all command in Diskpart and it took an hour to be completed but at the end nothing has changed. It has two drives: 16MB and 59GB drives. I guess the SD card is locked or encrypted by Android. When I try to delete the partition by fdisk in Linux, it will show a successful result but unable to create a new partition due to insufficient memory in virtual disk drive. I have followed this answer to unlock the SD card but the status shows that the SD card is unlocked. I have tried GParted as well but no luck. Is there a way to reuse my SD card as a portable storage?

GParted details when I delete the partition:

GParted 0.30.0 --enable-libparted-dmraid --enable-online-resize Libparted 3.2 Delete /dev/mmcblk0p2 (unknown, 59.46 GiB) from /dev/mmcblk0  00:00:08    ( SUCCESS ) calibrate /dev/mmcblk0p2  00:00:00    ( SUCCESS ) path: /dev/mmcblk0p2 (partition) start: 34816 end: 124735454 size: 124700639 (59.46 GiB) delete partition  00:00:08    ( SUCCESS ) libparted messages    ( INFO ) Input/output error during write on /dev/mmcblk0 ======================================== Delete /dev/mmcblk0p1 (unknown, 16.00 MiB) from /dev/mmcblk0  00:00:01    ( SUCCESS ) calibrate /dev/mmcblk0p1  00:00:00    ( SUCCESS ) path: /dev/mmcblk0p1 (partition) start: 2048 end: 34815 size: 32768 (16.00 MiB) delete partition  00:00:01    ( SUCCESS ) ========================================

GParted details when I try to format:

GParted 0.30.0 --enable-libparted-dmraid --enable-online-resize Libparted 3.2 Format /dev/mmcblk0p1 as fat16  00:00:01    ( ERROR ) calibrate /dev/mmcblk0p1  00:00:00    ( SUCCESS ) path: /dev/mmcblk0p1 (partition) start: 2048 end: 34815 size: 32768 (16.00 MiB) clear old file system signatures in /dev/mmcblk0p1  00:00:00    ( SUCCESS ) write 512.00 KiB of zeros at byte offset 0  00:00:00    ( SUCCESS ) write 512.00 KiB of zeros at byte offset 16252928  00:00:00    ( SUCCESS ) write 4.00 KiB of zeros at byte offset 16711680  00:00:00    ( SUCCESS ) write 8.00 KiB of zeros at byte offset 16769024  00:00:00    ( SUCCESS ) flush operating system cache of /dev/mmcblk0  00:00:00    ( SUCCESS ) set partition type on /dev/mmcblk0p1  00:00:01    ( SUCCESS ) new partition type: fat16 create new fat16 file system  00:00:00    ( ERROR ) mkfs.fat -F16 -v -I '/dev/mmcblk0p1'    ( EXECUTING ) Failed to execute child process “mkfs.fat” (Input/output error)    ( ERROR ) ======================================== Format /dev/mmcblk0p2 as fat32

Results for zeroing:

sudo dd if=/dev/zero of=/dev/mmcblk0 bs=8192 dd: error writing `dev/mmcblk0`: No space left on device 7795969+0 records in 7795968+0 records out 63864569856 bytes (64 GB, 59 CAB) copied, 3824.26 s, 16.7 MB/s

Results for amd64-stdtool status:

[+] Found RCA for /dev/mmcblk0: E624. [+] Card CSD: 400E005A7B590001DED48F700R808006. [+] Write protection state: Off.
2

I’m having a similar problem.

The SD card in my phone was set up as internal storage. I backed up my Android phone then performed a factory reset and now the SD card is not recognized and listed as “unsupported.” No matter what methods and software I have tried, I cannot format the SD card.

3

I successfully tried an usb card-reader and started the old HP_USB_Disk-Format-Tool (HPUSBFW_v223.exe) with Windows 10.
Be very carefull when selecting the volume!!!
A FAT32 Quick Format worked fine.

4

Me too