Adding external HDD to Raspberry Pi

[Gabor Szabo]

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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