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#1 2006-08-05 03:50:45
- rasat
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Kernel reads sda instead of hda
When installing Arch on a laptop the HD device showns as /dev/sda instead of /dev/hda. This causes problem for USB devices using same /dev/sda. When I tried with an old Knoppix live CD with kernel 2.4.x shows /dev/hda. How to fix?
Markku
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#2 2006-08-05 16:13:38
- rasat
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Re: Kernel reads sda instead of hda
> If you are using SATA drives, be aware that your drive
> designation may
> change when you upgrade to kernel 2.6.8.1
Found the above answer. Then what's the /dev/ designation for a USB device?
Markku
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#3 2006-08-05 17:13:04
- tomk
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Re: Kernel reads sda instead of hda
My USB kit still shows up as /dev/sdX. Presumably, if the hard disk takes sda, your USB devices will start with sdb?
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#4 2006-08-05 18:26:19
- Mr Green
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Re: Kernel reads sda instead of hda
sata here /dev/sda<number>
everything else b > ....
watch your udev rules ;-)
Mr Green
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#5 2006-08-05 20:29:33
- lanrat
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Re: Kernel reads sda instead of hda
USB devices should be assigned as sdb,sdc, etc.
Is the disk IDE or SATA?
What usb devices want to use /dev/sda ?
Any custom udev rules for sda ?
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#6 2006-08-06 17:52:45
- Mr Green
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Re: Kernel reads sda instead of hda
ok ok ...
like my sata drive shows as sda ... now why not have usb devices show as uda etc?
makes more sense
Would that be a kernel or udev thing?
Mr Green
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#7 2006-08-07 11:28:15
- lanrat
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Re: Kernel reads sda instead of hda
Using udev you can change it to:
/dev/mrgreen
/dev/mryellow
/dev/mrred
... :-D
but you need to have something to distinguish between usb and non usb devices (like "BUS" or something else).
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#8 2006-08-07 11:49:41
- Mr Green
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Re: Kernel reads sda instead of hda
only I use udev rule from wiki (auto mount usb devices) which is great but it clashes with my other rule/s for me mp3player....
emmm
sata = sda
usb (ports) = uda ?
seems to make more sense
/dev/mrgreen I no dev rofl 
Mr Green
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#9 2006-08-08 17:59:40
- lanrat
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Re: Kernel reads sda instead of hda
Why don't you place mp3 player rules before the general usb aoutomount rules and use OPTIONS="last_rule" ?
And how should it work when you have external sata disk connected through usb ? :-)
From the automounting point of view the name under /dev doesn't matter at all. The only name which is important is used in /media (and/or /mnt). The problem is you have to use %k (the name of the device given by the kernel) in an udev rule because other parameters are empty when you unplug the device and the umount rules don't work.
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#10 2006-08-08 19:07:22
- Mr Green
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Re: Kernel reads sda instead of hda
sata drive is internal ..... sda (like ide hda!)
Will try what you say ....
just thought to get a clear divide between the two uda etc... was a way of showing a usb device .... (ala Knoppix!)
At the moment usb connected devices show as sdb ... but of course they can be called anything even Lanrat ;-)
I was just thinking aloud again something I must stop doing lol
Mr Green
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