~ # twrp wipe data
Formatting cache using make_ext4fs...
Wiping data without wiping /data/media ...
Done.
Done processing script file


~ # cat /tmp/recovery.log | tail -n 40
I:Command 'wipe data' received
I:Set page: 'singleaction_page'
I:operation_start: 'TWRP CLI Command'
I:Inserting 'wipe data'
I:command is: 'wipe'
I:value is: 'data'
Formatting cache using make_ext4fs...
Creating filesystem with parameters:
    Size: 335544320
    Block size: 4096
    Blocks per group: 32768
    Inodes per group: 6832
    Inode size: 256
    Journal blocks: 1280
    Label:
    Blocks: 81920
    Block groups: 3
    Reserved block group size: 23
Created filesystem with 11/20496 inodes and 2620/81920 blocks
warning: wipe_block_device: Wipe via secure discard failed, used discard instead

I:Recreating /cache/recovery folder.
I:Copying file /etc/recovery.fstab to /cache/recovery/recovery.fstab
I:Version number saved to '/cache/recovery/.version'
Wiping data without wiping /data/media ...
I:skipped '/data/lost+found'
I:skipped '/data/misc/vold'
I:skipped '/data/system/storage.xml'
I:skipped '/data/media'
I:skipped '/data/.layout_version'
Done.