Disk /dev/sdb: 931,5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x18dfe45b

Dispositivo Avvio    Start       Fine    Settori   Size Id Tipo
/dev/sdb1             2048   39063551   39061504  18,6G 82 Linux swap / Solaris
/dev/sdb2         39065598 1953523711 1914458114 912,9G  5 Esteso
/dev/sdb5         39065600 1953523711 1914458112 912,9G 83 Linux

Partition 2 does not start on physical sector boundary.