I don't know what invokation of lsblk you're using. When I run lsblk on my 
machine, I get
something like this:
ham:~$ lsblk
NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
nvme0n1     259:0    0 238.5G  0 disk
├─nvme0n1p1 259:1    0     1G  0 part /boot
├─nvme0n1p2 259:2    0 228.7G  0 part /nix/store
│                                     /
└─nvme0n1p3 259:3    0   8.8G  0 part [SWAP]

Not seeing any 'data' parts in the TYPE column, there. If I run `lsblk -f` (to 
show
filesystem information):
NAME        FSTYPE FSVER LABEL UUID                                 FSAVAIL 
FSUSE% MOUNTPOINTS
nvme0n1
├─nvme0n1p1 vfat   FAT32       87C7-181E                             768.7M    
25% /boot
├─nvme0n1p2 ext4   1.0         7ec00b9f-e09d-4c0d-af55-34b2f412e3bf   71.4G    
63% /nix/store
│                                                                               
   /
└─nvme0n1p3 swap   1     swap  0d462dac-ca81-4f49-a1f9-d9c1b0f3323c             
   [SWAP]

I'm seeing filesystem designations in the FSTYPE column. My intuition would 
indicate that
if you're just seeing 'data' in the FSTYPE column, there's not a filesystem 
that lsblk
could recognize. Can you give us more information about your card? Dump the 
first sector
or so to see what filesystem headers there are, if any?

In the mean time, you can make a full disk backup with dd so you can format the 
card and use
it in other capacities. In order to do that, you'd probably do something like 
this:

sudo dd if=/dev/your_sd_card_here of=./your_sd_card.img bs=1M

Make sure that you have enough storage space on the medium holding that disk 
image backup.

Hope this helps,
Ryan
https://beepboop.systems

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