[ubuntu-in] Problems with USB driven External HD

[Kingsly John]

+++ Ramnarayan.K [2011-01-02 16:43:03]:

> The transcend casing has a funny way of working - the usb cable has two inputs
> - one for power and one for data - and if ever the power section is not
> inserted (into the computer) then the externl HD tends to crash - and i think
> my not using this power usb cable resulted in the hd crashing and getting
> spoilt.

It is not one for power and one for data.

USB ports can only supply 500mA of power one each port. And most hard disks
require more than 500mA to operate. So they cannot be powered by a single port.
(Some newer disks operate at 500mA and can be powered by a single port.)

Either these devices should be directly plugged into ports on the PC and not
into an unpowered hub. (Each Hub draws 100mA for itself so only 400mA is
available for all the devices connected to it.)

> Now when i insert it i get the following error message
> 
> Error mounting: mount exited with exit code 32: mount: wrong fs type, bad
> option, bad superblock on /dev/sdb8,
>        missing codepage or helper program, or other error
>        In some cases useful info is found in syslog - try
>        dmesg | tail  or so

What is the output of  "fdisk -l /dev/sdb" ?

Kingsly

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