udev and Iomega Zip drives

udev and Iomega Zip drives

[Alex Malinovich]

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I just started using udev and I'm really thrilled so far. Having 4 USB
drives always appearing on the correct /dev/ entry is REALLY nice. Well,
make that 3. The 4th one is my Iomega Zip drive. And while it appears at
the correct /dev/ entry, it doesn't create any partition entries unless
the drive was plugged in with a disk already inside.

If I add a disk later, I have to access the drive in order for the disk
to be detected (fdisk -l /dev/iomega-zip for example). The problem is
that Zip drives ONLY use partition 4. So in order to mount the disk, I
have to mount /dev/iomega-zip4. I want that entry to be created as soon
as /dev/iomega-zip is created, regardless of whether there is a disk or
not so that when there IS a disk inside, I won't have to run fdisk -l or
anything else first. Unfortunately, using NAME{all_partitions} doesn't
work because it creates 15 partitions. This causes the drive to get VERY
confused and to spew out all sorts of invalid partition errors.

So is there a way to create just the partition 4 device as soon as the
device entry is created? Thanks in advance for any help.
-- 
Alex Malinovich
Support Free Software, delete your Windows partition TODAY!
Encrypted mail preferred. You can get my public key from any of the
pgp.net keyservers. Key ID: A6D24837


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Re: udev and Iomega Zip drives

[Michal Čihař]

Hi

Original message (Alex Malinovich, Thursday 11.03.2004 04:42 -0600):
> I just started using udev and I'm really thrilled so far. Having 4 USB
> drives always appearing on the correct /dev/ entry is REALLY nice. Well,
> make that 3. The 4th one is my Iomega Zip drive. And while it appears at
> the correct /dev/ entry, it doesn't create any partition entries unless
> the drive was plugged in with a disk already inside.
> 
> If I add a disk later, I have to access the drive in order for the disk
> to be detected (fdisk -l /dev/iomega-zip for example). The problem is
> that Zip drives ONLY use partition 4. So in order to mount the disk, I
> have to mount /dev/iomega-zip4. I want that entry to be created as soon
> as /dev/iomega-zip is created, regardless of whether there is a disk or
> not so that when there IS a disk inside, I won't have to run fdisk -l or
> anything else first. Unfortunately, using NAME{all_partitions} doesn't
> work because it creates 15 partitions. This causes the drive to get VERY
> confused and to spew out all sorts of invalid partition errors.
> 
> So is there a way to create just the partition 4 device as soon as the
> device entry is created? Thanks in advance for any help.

I had simmilar problem with USB card reader (partiotions were not
created), I solved it by writing simple daemon which tries to open
device (/dev/iomega) in your case.  This is enough for reader to rescan
partitions and in case there is card udev creates partitions, like it
should.

If interested, you can get it from my tla archive - 
http://www.cihar.com/{archives}/2004-main/ (polld--main--0.1).

-- 
Regards
	Michal Čihař
	http://cihar.com


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