En checkant un peu dans les pages de man et d'après ce que j'ai compris, ce serait en effet bien UDEV qui gèrerait l'histoire via un paquet de fichiers de "configuration".
Par curiosité, j'ai été un peu voir ce qu'il y avait dans ces fichiers et un m'a l'air assez intéressant, à savoir celui-ci: /etc/udev/rules.d/50-udev.rules et plus précisément du côté de la ligne 275 chez moi.
Je laisse un petit extrait car je suis pas sûr de comprendre ce que ça fait:
#######################################
# Persistent block device stuff - begin
#######################################
# persistent disk links: /dev/disk/{by-id,by-uuid,by-label,by-path}
# scheme based on "Linux persistent device names", 2004, Hannes Reinecke <hare@suse.de>
ACTION!="add", GOTO="persistent_end"
SUBSYSTEM!="block", GOTO="persistent_end"
# skip rules for inappropriate block devices
KERNEL=="ram*|loop*|fd*|nbd*|gnbd*", GOTO="persistent_end"
# never access removable ide devices, the drivers are causing event loops on open()
BUS=="ide", DRIVER!="ide-cdrom", SYSFS{removable}=="1", GOTO="persistent_end"
BUS=="ide", KERNEL=="hd*[0-9]", SYSFS{../removable}=="1", GOTO="persistent_end"
# by-id (hardware serial number)
KERNEL=="hd*[!0-9]", IMPORT{program}="/lib/udev/ata_id --export $tempnode"
KERNEL=="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/ata-$env{ID_MODEL}_$env{ID_SERIAL}"
KERNEL=="hd*[0-9]", IMPORT{parent}=="ID_*", SYMLINK+="disk/by-id/ata-$env{ID_MODEL}_$env{ID_SERIAL}-part%n"
KERNEL=="sd*[!0-9]|sr*", SYSFS{ieee1394_id}=="*", ENV{ID_SERIAL}="$sysfs{ieee1394_id}", ENV{ID_BUS}="ieee1394"
KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}=="", IMPORT{program}="/lib/udev/usb_id -x"
KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}=="", IMPORT{program}="/lib/udev/scsi_id -g -x -s %p -d $tempnode"
KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}=="", IMPORT{program}="/lib/udev/scsi_id -g -x -a -s %p -d $tempnode"
KERNEL=="dasd*[!0-9]", IMPORT{program}="/lib/udev/dasd_id --export $tempnode"
KERNEL=="sd*[!0-9]|sr*|dasd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}"
# for partitions import parent information
KERNEL=="sd*[0-9]|dasd*[0-9]", IMPORT{parent}=="ID_*"
KERNEL=="sd*[0-9]|dasd*[0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}-part%n"
# by-path (shortest physical path)
KERNEL=="*[!0-9]|sr*", ENV{ID_TYPE}=="?*", IMPORT{program}="/lib/udev/path_id %p", SYMLINK+="disk/by-path/$env{ID_PATH}"
KERNEL=="sr*", GOTO="persistent_end"
KERNEL=="*[0-9]", IMPORT{parent}=="ID_*"
KERNEL=="*[0-9]", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-part%n"
# by-label/by-uuid (filesystem properties)
KERNEL=="*[!0-9]", SYSFS{removable}=="1", GOTO="persistent_end"
IMPORT{program}="/lib/udev/vol_id --export $tempnode"
ENV{ID_FS_UUID}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID}"
ENV{ID_FS_LABEL_SAFE}=="?*", SYMLINK+="disk/by-label/$env{ID_FS_LABEL_SAFE}"
# BIOS Enhanced Disk Device
KERNEL=="*[!0-9]", IMPORT{program}="/lib/udev/edd_id --export $tempnode"
KERNEL=="*[!0-9]", ENV{ID_EDD}=="?*", SYMLINK+="disk/by-id/edd-$env{ID_EDD}"
KERNEL=="*[0-9]", ENV{ID_EDD}=="?*", SYMLINK+="disk/by-id/edd-$env{ID_EDD}-part%n"
LABEL="persistent_end"
#####################################
# Persistent block device stuff - end
#####################################
PS: La ligne 275 est la ligne
KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}=="", IMPORT{program}="/lib/udev/usb_id -x"
