Right now, I have an external hard drive that has its own power supply. When I first installed the system, it was able to recognize the hard drive, which I mounted and then added to the fstab. Every reboot after that however, the pi will not detect it at all. It doesn't show up at all through sudo fdisk -l. I initially thought that it was the SD but the same thing happened with another SD and a clean installing.
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1 Answer
Hep; It sounds almost like a loose micro-usb as it works pretty well out of the box:
pi@raspberrypi ~ $ sudo fdisk -l
Disk /dev/mmcblk0: 7822 MB, 7822376960 bytes
4 heads, 16 sectors/track, 238720 cylinders, total 15278080 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
Disk identifier: 0x000b5098
Device Boot Start End Blocks Id System
/dev/mmcblk0p1 8192 122879 57344 c W95 FAT32 (LBA)
/dev/mmcblk0p2 122880 15278079 7577600 83 Linux
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 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
Disk identifier: 0xe8900690
Device Boot Start End Blocks Id System
/dev/sda1 63 1953520064 976760001 83 Linux
As you can see above sudo fdisk -l works fine.
With this we need a mount point:
pi@raspberrypi ~ $ sudo mkdir /media/usbhdd
From here we can open and edit the /etc/fstab, using:
pi@raspberrypi ~ $ sudo nano /etc/fstab
So you can add the last line of the fstab for your usb hdd. Your result should look like shown below (consult man fstab if you are in doubt about your filesystem).
pi@raspberrypi ~ $ cat /etc/fstab
proc /proc proc defaults 0 0
/dev/mmcblk0p1 /boot vfat defaults 0 2
/dev/mmcblk0p2 / ext4 defaults,noatime 0 1
# a swapfile is not a swap partition, so no using swapon|off from here on, use dphys-swapfile swap[on|off] for that
**/dev/sda1 /media/usbhdd ext4 defaults 0 0**
The last line (above) is my fstab that automounts the external usb HDD at boot.
Now you can see the hdd using: df -h
pi@raspberrypi ~ $ df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 7.1G 2.5G 4.3G 37% /
/dev/root 7.1G 2.5G 4.3G 37% /
devtmpfs 215M 0 215M 0% /dev
tmpfs 44M 236K 44M 1% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 88M 0 88M 0% /run/shm
/dev/mmcblk0p1 56M 9.5M 47M 17% /boot
/dev/sda1 917G 366M 870G 1% /media/usbhdd
I hope this helps for checking that you didn't miss anything :-)
