Check dmesg for storage devices...

• dmesg | less
• dmesg | grep hda
• dmesg | grep sda

Get a listing from fdisk:

• fdisk -l

Check in /dev:

• ls /dev/disk/by-id
• ls /dev/disk/by-uuid
• ls /dev/disk/by-path

Check in /proc:

• cat /proc/partitions

Use other hardward-detection tools:

• emerge pciutils;   lspci
• emerge hwreport;   hwreport [output_file]
• emerge lshw;   lshw
• emerge hwinfo;   hwinfo
• emerge usbutils;  lsusb