Hallo Dan, Hello Tony
Dan McGhee said the following on 07/25/08 01:45:
I bought an usb disk. Passport Essential, 160 GB:
Manufacture: Western Digital
Vendor ID: 13FD
Product ID: 160E (External Drive)
When I try to mount it on my PC ( linux from scratch) it will not be
recognised: I cannot mount it It does not appear in the list
/dev/xxx:. On my laptop, with exactly the same LFS system, the
external disks are smootly recognised by the OS.
The device came formated in fat32. I reformated it on the laptop with
the help of "Gparted" ( recommended by WD ). I created two NTFS
(ntfs-3g) partitions and another ext3 one. All of them worked smoothly
under Linux on the laptop.
On the PC-box it did not work, no way. Both, PC and laptop have the
same LFS system taken from one Image. In Windows-Virtutal Box under
Linux as host it did also not work .
Check `dmesg` or syslog. If you are getting the recognition in lsusb
and /proc I think it's registering. Now it's just a matter of mounting
it. With no modification to any file, my external hard drive registers
as sd[a-b] depending on whether I have my memory stick in use also.
I've been too lazy to write a "persistent" udev rule.
Speaking of udev rules, check the udev rules on your PC and laptop. If
that doesn't help you, you can write your own or modify the 25(I
think)-lfs.rule to include your external drive.
Now if your situation is just one of mounting the drive at boot time or
when you plug it in, you will have to manually mount it unless it's in
/etc/fstab.
Dan
The solution of this problem may also be interesting for others. So, for
the records:
the problem was an electrical one: the resistance of the connection
cable was too high for a USB device with power supply through the USB
connection only. Devices with 30 GB capacity are free of problems. 60 GB
disks more or less also. 160 GB are on the limit. They work, if the
connection wire is very short and the cross section large, it means, if
the ohm ressistance is low. The limit are the 100 mA of USB.
We checked this with all three mentioned GB-capacities on different
PC's, the results were
unequivocal.
Kind regards and thank you all very much for the contributions.
Beatriz
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n:Botero H.;Beatriz
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