Adding external HDD to Raspberry Pi

[Amos Shapira]

Get a powered USB hub (i.e. a usb hub which also connects to a wall power
socket). I'm not familiar with RPi USB version but check for USB 3.0 vs.
2.0.

On 15 December 2014 at 06:07, Gabor Szabo <gabor at szabgab.com> wrote:
>
> Hmm, good question. The Raspberry does see the device when it is
> connected, so is it possible that it needs more
> power after later on?
>
> How can I check?
>
> If the problem is lack of current, how can I solve that? Can I put one of
> these usb hubs that also provide power between the two?
>
> Gabor
>
> On Sun, Dec 14, 2014 at 8:43 PM, E.S. Rosenberg <esr+linux-il at g.jct.ac.il>
> wrote:
>>
>> Are you providing the external HDD with sufficient electricity? The
>> Raspberry is most likely not capable of providing enough current...
>>
>> 2014-12-14 19:30 GMT+02:00 Gabor Szabo <gabor at szabgab.com>:
>>
>>> So finally I install the Raspberry Pi I bought a few weeks ago and
>>> wanted to add an external HDD.
>>> I plugged in the external hard drive and /var/log/syslog printed the
>>> following:
>>>
>>>
>>> Dec 14 17:02:55 pi kernel: [  759.981949] usb 1-1.3: new high-speed USB
>>> device number 8 using dwc_otg
>>>
>>> Dec 14 17:02:55 pi kernel: [  760.163364] usb 1-1.3: New USB device
>>> found, idVendor=1058, idProduct=0820
>>>
>>> Dec 14 17:02:55 pi kernel: [  760.163398] usb 1-1.3: New USB device
>>> strings: Mfr=1, Product=2, SerialNumber=5
>>>
>>> Dec 14 17:02:55 pi kernel: [  760.163414] usb 1-1.3: Product: My
>>> Passport 0820
>>>
>>> Dec 14 17:02:55 pi kernel: [  760.163429] usb 1-1.3: Manufacturer:
>>> Western Digital
>>>
>>> Dec 14 17:02:55 pi kernel: [  760.163444] usb 1-1.3: SerialNumber:
>>> 57583431413432454363833
>>>
>>> Dec 14 17:02:55 pi kernel: [  760.169522] usb-storage 1-1.3:1.0: USB
>>> Mass Storage device detected
>>>
>>> Dec 14 17:02:55 pi kernel: [  760.181935] scsi0 : usb-storage 1-1.3:1.0
>>>
>>> Dec 14 17:02:56 pi kernel: [  761.183065] scsi 0:0:0:0: Direct-Access
>>>   WD       My Passport 0820 1012 PQ: 0 ANSI: 6
>>>
>>> Dec 14 17:02:56 pi kernel: [  761.187365] scsi 0:0:0:1: Enclosure
>>>   WD       SES Device       1012 PQ: 0 ANSI: 6
>>>
>>> Dec 14 17:02:56 pi kernel: [  761.189473] sd 0:0:0:0: [sda] Spinning up
>>> disk...
>>>
>>> Dec 14 17:02:56 pi kernel: [  761.277106] sd 0:0:0:0: Attached scsi
>>> generic sg0 type 0
>>>
>>> Dec 14 17:02:56 pi kernel: [  761.278094] scsi 0:0:0:1: Attached scsi
>>> generic sg1 type 13
>>>
>>>
>>> But then when I try to run
>>>
>>>
>>> $ sudo fdisk /dev/sda
>>>
>>> I get
>>>
>>> fdisk: unable to open /dev/sda: No such device or address
>>>
>>> $ ls -l /dev/sda
>>>
>>> brw-rw---T 1 root floppy 8, 0 Dec 14 17:21 /dev/sda
>>>
>>> $ sudo fdisk -l
>>>
>>> only lists the sdcard
>>>
>>>
>>> The external disk is brand new and it has NTFS on it. I have not handled
>>> disk in linux for a long time, but a I recall I am supposed to use fdisk to
>>> partition it and then use mkfs.ext4 to format.
>>>
>>>
>>> So what am I missing here?
>>>
>>>
>>> Gabor
>>>
>>>
>>>
>
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