[PROBLEM] which device is my USB HDD?

[mmontev]

bought a new Samsung M3 1tb usb HDD.
connected to the Pi. Powered up, everithing OK. The disk was recognized, mounted and samba shared automatically. I can write read and delete. Great.

I wanted to format the drive to ext4, for better peformance. I stopped samba, ok.
But I couldn't find which devide the drive is. Here is what I get:

fidsk:

Terminal

root@xbian:/dev# fdisk -l

Disk /dev/mmcblk0: 3947 MB, 3947888640 bytes
4 heads, 16 sectors/track, 120480 cylinders, total 7710720 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: 0x000f06a6

Device Boot Start End Blocks Id System
/dev/mmcblk0p1 2048 71679 34816 c W95 FAT32 (LBA)
/dev/mmcblk0p2 71680 7710719 3819520 83 Linux

mount:

Terminal

root@xbian:/dev# mount -l
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,relatime,size=10240k,nr_inodes=47789,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620)
tmpfs on /run type tmpfs (rw,nosuid,noatime)
/dev/mmcblk0p2 on / type btrfs (rw,noatime,thread_pool=1,compress=lzo,ssd,space_cache,autodefrag) [xbian-root-btrfs]
none on /sys/kernel/debug type debugfs (rw,relatime)
none on /sys/kernel/security type securityfs (rw,relatime)
none on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
none on /run/shm type tmpfs (rw,nosuid,nodev,relatime)
none on /run/user type tmpfs (rw,nosuid,nodev,noexec,relatime,size=102400k,mode=755)
/dev/mmcblk0p1 on /boot type vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,​errors=remount-ro)
/dev/mmcblk0p2 on /home type btrfs (rw,noatime,thread_pool=1,compress=lzo,ssd,space_cache,autodefrag) [xbian-root-btrfs]

df:

Terminal

root@xbian:/dev# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 3.7G 2.2G 1.3G 65% /
udev 10M 4.0K 10M 1% /dev
tmpfs 189M 172K 189M 1% /run
/dev/mmcblk0p2 3.7G 2.2G 1.3G 65% /
none 5.0M 0 5.0M 0% /run/lock
none 189M 0 189M 0% /run/shm
none 100M 0 100M 0% /run/user
/dev/mmcblk0p1 34M 13M 22M 37% /boot
/dev/mmcblk0p2 3.7G 2.2G 1.3G 65% /home

I see the drive mounted in:
/media/SAMSUNG-D680D17280D15997 (or /media/usb0).
It's alive. I can use it. But I can't find which device it is.
Any help? How it is supposed to format the disk?

Thanks

[mk01]

currently with the outputs you posted it is none. could it be it was removed just before you did the df, mount and fdisk outputs?

anyhow, once again available under /media/SAMSUNG-D680D17280D15997, just run this command:

Code:

findmnt -o source -T /media/SAMSUNG-D680D17280D15997

it will show you just the block device name you are looking for.

[mmontev]

Hi mk01,

No, the outputs I posted are what I get with the disk alive.
In addition I stopped xbmc after the first post. same commands, same result.

and no luck with the command you give me. here what I get:

Terminal

root@xbian:/media# findmnt -o source -T /media/SAMSUNG-D680D17280D15997
root@xbian:/media# findmnt
TARGET SOURCE FSTYPE OPTIONS
/ /dev/mmcblk0p2[/root/@] btrfs rw,noatime,thread_pool=1,compress=lzo,ssd,space_cache,autodefrag
ââ/sys sysfs sysfs rw,nosuid,nodev,noexec,relatime
â ââ/sys/kernel/debug debugfs rw,relatime
â ââ/sys/kernel/security securityfs rw,relatime
ââ/proc proc proc rw,nosuid,nodev,noexec,relatime
ââ/dev udev devtmpfs rw,relatime,size=10240k,nr_inodes=47789,mode=755
â ââ/dev/pts devpts devpts rw,nosuid,noexec,relatime,gid=5,mode=620
ââ/run tmpfs tmpfs rw,nosuid,noatime
â ââ/run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k
â ââ/run/shm tmpfs rw,nosuid,nodev,relatime
â ââ/run/user tmpfs rw,nosuid,nodev,noexec,relatime,size=102400k,mode=755
ââ/boot /dev/mmcblk0p1 vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,e​rrors=remount-ro
ââ/home /dev/mmcblk0p2[/home/@] btrfs rw,noatime,thread_pool=1,compress=lzo,ssd,space_cache,autodefrag

last question: how can I get the size of the disk (/media/usb0)? I would like to check what the system sees.

regards,
diego

(8th Sep, 2013 06:34 AM)mk01 Wrote:  currently with the outputs you posted it is none. could it be it was removed just before you did the df, mount and fdisk outputs?

anyhow, once again available under /media/SAMSUNG-D680D17280D15997, just run this command:

Code:

findmnt -o source -T /media/SAMSUNG-D680D17280D15997

it will show you just the block device name you are looking for.

---

one more:
what is supposed to be in /dev/bus/usb/001? I see three "files" there: 001, 002 and 003.

[mk01]

if there is no /media/SAMSUNG-D680D17280D15997 in the list of "findmnt" without parameters, then the device is not mounted.

if there is no additional device in the list of "fdisk -l" (beside /dev/mmcblk0), then system detected no additional disks.

can you post "dmesg" output to a pastebin.com or somewhere for review?

[IriDium]

I think this is a bus powered drive, so I hope it is not connected directly to the RPi. Bus powered drives must always be via a powered hub and not the RPi.

So I wonder if "it" failed after the initial mount.

[mmontev]

I finally reinstalled xbian to de SD and now it seems to work.

In addition to what I posted here I found some really strange behaviour trough putty, and a kind of ghost mounted HDD on the /dev/mmcblk0p2 space. This leave no space on the SD partitions. Now I'm starting from zero, but with the drive already formatted to ext4.

And I can tell that is that I really don't think it has to do with the power supply. I use a big linear regulated (7805) PS that feeds the Pi on the GPIO power pins directly. I'm reading the voltage with a tester and it remains stable.

Here what I had on /media before reflash:
SAMSUNG-D680D17280D15997 ---> mistery
SamsungHDD-09d3dad4-9e14-400f-93d9-b6eaa8955392 --> the HDD name after ext4 formatting
usb0 --> alias of SAMSUNG-D680D17280D15997

I also found that SAMSUNG-D680D17280D15997 uses the space of /dev/mmcblk0p2. /dev/mmcblk0p2 is what remains of the SD card. It get full after some write tests supposed to be to the HDD. I deleted SAMSUNG-D680D17280D15997 which seemed to be a folder. Got some space on /dev/mmcblk0p2 gained and link /media/usb0 broken. but after reboot SAMSUNG-D680D17280D15997 and usb0 reappeared, with de SD full.

thanks and regard,
Diego

PS: must I modify the subject with "solved" o something?

[mk01]

run "sudo blkid" and post output.

[mmontev]

(11th Sep, 2013 07:56 AM)mk01 Wrote:  run "sudo blkid" and post output.

Terminal

root@xbian:/media/usb0# blkid
/dev/mmcblk0p1: SEC_TYPE="msdos" UUID="8B12-9112" TYPE="vfat"
/dev/mmcblk0p2: LABEL="xbian-root-btrfs" UUID="827af4f9-4fcd-4994-bd5a-cab9fba3047c" UUID_SUB="4f549a87-f9dc-4b26-8575-a66f8b85ea5c" TYPE="btrfs"
/dev/zram0: UUID="8194afd5-fbbd-49a2-8637-db7d07be892f" TYPE="swap"
/dev/sda1: LABEL="SamsungHDD" UUID="09d3dad4-9e14-400f-93d9-b6eaa8955392" TYPE="ext4"
/dev/loop0: UUID="86b14831-ec1e-44e2-bfd7-e2b80bc96a1f" TYPE="swap"
root@xbian:/media/usb0#

---

[mk01]

can you do a

Code:

sudo rmdir /media/SAMSUNG-D680D17280D15997
sudo rm -f /media/usb0