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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 06-25-2011, 12:36 PM   #16
Thor_2.0
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Registered: Nov 2007
Location: Somewhere on my hard drive...
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Quote:
Sorry, but this is far above my knowlege so I behave clumsily, I fear.
Dont apologise...this is where Linux comes into its own: the learning curve and the community. You're not on your own here

Okay, let's go down the checklist again to see what we missed:

issued fdisk -l in the console, can you see the external drive? What is its name?

Issued umount /dev/sdb

likely sdb is the external drive

what happens?

If you're not root, the command could be "blackholed" by bash without feedback, fdisk does that on my machine. I issue it and ... nothing.

If you can unmount the drive...but it powers up again. So it could be a persistent process (Xorg is one of them, it dies and comes back for more), okay, let's look at /etc/inittab, list it and look for the word "respawn" - those are the respawning processes. Is the process for the external drive in there?

I'll do some more digging here...the plot thickens (never understood that one ...)

Thor

Last edited by Thor_2.0; 06-25-2011 at 12:53 PM.
 
Old 06-26-2011, 12:31 AM   #17
gorade
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Registered: Nov 2010
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Quote:
Originally Posted by Thor_2.0 View Post
[B]

issued fdisk -l in the console, can you see the external drive? What is its name?

Issued umount /dev/sdb

likely sdb is the external drive

what happens?

If you're not root, the command could be "blackholed" by bash without feedback, fdisk does that on my machine. I issue it and ... nothing.

If you can unmount the drive...but it powers up again. So it could be a persistent process (Xorg is one of them, it dies and comes back for more), okay, let's look at /etc/inittab, list it and look for the word "respawn" - those are the respawning processes. Is the process for the external drive in there?

I'll do some more digging here...the plot thickens (never understood that one ...)

Thor
Name of the drive is sdc1. umount /dev/sdc1 unmounts it but doesn't turn power off.

From itittab:
1:2345:respawn:/sbin/getty 38400 tty1
2:23:respawn:/sbin/getty 38400 tty2
3:23:respawn:/sbin/getty 38400 tty3
4:23:respawn:/sbin/getty 38400 tty4
5:23:respawn:/sbin/getty 38400 tty5
6:23:respawn:/sbin/getty 38400 tty6

# Example how to put a getty on a serial line (for a terminal)
#
#T0:23:respawn:/sbin/getty -L ttyS0 9600 vt100
#T1:23:respawn:/sbin/getty -L ttyS1 9600 vt100

# Example how to put a getty on a modem line.
#
#T3:23:respawn:/sbin/mgetty -x0 -s 57600 ttyS3

Last edited by gorade; 06-26-2011 at 03:09 AM.
 
  


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