oui, c'était bien /dev/sbd1
Voici ce que j'obtiens avec les commandes :
fdisk -l /dev/sda
Disk /dev/sda: 2.5 GiB, 2621440000 bytes, 5120000 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: 0x045cc1ab
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 5117951 5115904 2.5G 83 Linux
fdisk -l /dev/sdb
Disk /dev/sdb: 26.6 GiB, 28546756608 bytes, 55755384 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: 0x7937ad62
Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 2048 83886046 83883999 40G 83 Linux
smartctl -a /dev/sda
smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.9.0-8-amd64] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Vendor: QEMU
Product: QEMU HARDDISK
Revision: 2.5+
User Capacity: 2,621,440,000 bytes [2.62 GB]
Logical block size: 512 bytes
LU is thin provisioned, LBPRZ=0
Rotation Rate: 5400 rpm
Device type: disk
Local Time is: Thu Feb 7 22:17:22 2019 UTC
SMART support is: Unavailable - device lacks SMART capability.
=== START OF READ SMART DATA SECTION ===
Current Drive Temperature: 0 C
Drive Trip Temperature: 0 C
Error Counter logging not supported
Device does not support Self Test logging
smartctl -a /dev/sdb
smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.9.0-8-amd64] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Vendor: QEMU
Product: QEMU HARDDISK
Revision: 2.5+
User Capacity: 28,546,756,608 bytes [28.5 GB]
Logical block size: 512 bytes
LU is thin provisioned, LBPRZ=0
Rotation Rate: 5400 rpm
Device type: disk
Local Time is: Thu Feb 7 22:17:59 2019 UTC
SMART support is: Unavailable - device lacks SMART capability.
=== START OF READ SMART DATA SECTION ===
Current Drive Temperature: 0 C
Drive Trip Temperature: 0 C
Error Counter logging not supported
Device does not support Self Test logging
Les commandes smartctl donnent un peu n'importe quoi avec les disques SSD. Mais on voit que la capacité affichée du disque sdb est de 28.5 GB ou lieu de 40 !