$ sudo fdisk -l /dev/sdb

Disk /dev/sdb: 14.6 GiB, 15619588096 bytes, 30507008 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: 0x6e697373

Device     Boot      Start        End    Sectors   Size Id Type
/dev/sdb1  ?    1936269394 3772285809 1836016416 875.5G 4f QNX4.x 3rd part
/dev/sdb2  ?    1917848077 2462285169  544437093 259.6G 73 unknown
/dev/sdb3  ?    1818575915 2362751050  544175136 259.5G 2b unknown
/dev/sdb4  ?    2844524554 2844579527      54974  26.9M 61 SpeedStor

Partition table entries are not in disk order.