pi@bpi-iot-ros-ai:~ $ sudo mount /dev/sdb1 /mnt/a
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.
pi@bpi-iot-ros-ai:~ $ sudo parted /dev/sdb
GNU Parted 3.2
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: StoreJet  Transcend (scsi)
Disk /dev/sdb: 250GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End    Size   Type     File system  Flags
 1      1049kB  250GB  250GB  primary  ext4

(parted) rm 1
(parted) print
Model: StoreJet  Transcend (scsi)
Disk /dev/sdb: 250GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start  End  Size  Type  File system  Flags

(parted) mklabel msdos
Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want
to continue?
Yes/No? Yes
(parted) mkpart primary ext4 1MiB 100%
(parted) print
Model: StoreJet  Transcend (scsi)
Disk /dev/sdb: 250GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End    Size   Type     File system  Flags
 1      1049kB  250GB  250GB  primary  ext4         lba

(parted) quit
Information: You may need to update /etc/fstab.

pi@bpi-iot-ros-ai:~ $ sudo parted /dev/sdb
GNU Parted 3.2
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) quit
pi@bpi-iot-ros-ai:~ $ sudo mkfs.ext4 /dev/sdb1
mke2fs 1.43.3 (04-Sep-2016)
/dev/sdb1 contains a ext4 file system
        created on Mon Jan 27 19:34:39 2020
Proceed anyway? (y,n) y
Suggestion: Use Linux kernel >= 3.18 for improved stability of the metadata and journal checksum features.
Creating filesystem with 61049344 4k blocks and 15269888 inodes
Filesystem UUID: 86c2d2b8-c4aa-4816-9907-516bcd6f34e1
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872

Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done

pi@bpi-iot-ros-ai:~ $ sudo mount /dev/sdb1 /mnt/a
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.
pi@bpi-iot-ros-ai:~ $ dmesg | tail or so
tail: cannot open ‘or’ for reading: No such file or directory
tail: cannot open ‘so’ for reading: No such file or directory
pi@bpi-iot-ros-ai:~ $ dmesg | tail
[ 1207.326141] [rfkill]: rfkill set power 0
[ 1212.366738] [rfkill]: rfkill set power 0
[ 1217.406139] [rfkill]: rfkill set power 0
[ 1222.446093] [rfkill]: rfkill set power 0
[ 1227.485944] [rfkill]: rfkill set power 0
[ 1232.527153] [rfkill]: rfkill set power 0
[ 1237.567162] [rfkill]: rfkill set power 0
[ 1242.606512] [rfkill]: rfkill set power 0
[ 1247.646688] [rfkill]: rfkill set power 0
[ 1252.686483] [rfkill]: rfkill set power 0
pi@bpi-iot-ros-ai:~ $ dmesg | grep sdb1
[   25.791817]  sdb: sdb1
[   29.836390] EXT4-fs (sdb1): couldn't mount RDWR because of unsupported optional features (400)
[  178.992394] EXT4-fs (sdb1): couldn't mount RDWR because of unsupported optional features (400)
[  301.185232] EXT4-fs (sdb1): couldn't mount RDWR because of unsupported optional features (400)
[  318.209026]  sdb: sdb1
[  319.202418] EXT4-fs (sdb1): couldn't mount RDWR because of unsupported optional features (400)
[  338.577850]  sdb: sdb1
[  339.461389] EXT4-fs (sdb1): couldn't mount RDWR because of unsupported optional features (400)
[ 1204.994044] EXT4-fs (sdb1): couldn't mount RDWR because of unsupported optional features (400)
pi@bpi-iot-ros-ai:~ $ fdisk -l /dev/sdb
fdisk: cannot open /dev/sdb: Permission denied
pi@bpi-iot-ros-ai:~ $ sudo fdisk -l /dev/sdb

Disk /dev/sdb: 232.9 GiB, 250059350016 bytes, 488397168 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: dos
Disk identifier: 0x0401421c

Device     Boot Start       End   Sectors   Size Id Type
/dev/sdb1        2048 488396799 488394752 232.9G 83 Linux