Re: PCMCIA cards in laptops: do they need to be mounted/unmounted when installed/removed?
- From: Paul Johnson <baloo@xxxxxxxxx>
- Date: Wed, 21 Feb 2007 15:44:20 -0800
Ken Heard wrote:
Thanks everyone for the replies. If I understand them correctly, the
situation is as follows:
PCMCIA cards can be hot plugged and hot unplugged just like for instance
USB devices.
Right.
However, also like USB devices, if the PCMCIA card is or contains a
mobile storage device, to gain access to the storage on the device it
has to be mounted. Likewise, before such a PCMCIA card, like USB
storage devices, is removed, it should be unmounted in the same manner.
Right.
As it happens, I still have a PCMCIA adapter for CF cards, which is what
was used to connect CF cards to laptops before the days of USB ports on
laptops. So I put a CF card in it and inserted it into a PCMCIA slot.
"pcccardctl ident" returned:
product info: "HITACHI", "FLASH", "5.0", ""
manfid: 0x0007, 0x0000
function: 4 (fixed disk)
Dmesg however told me much more. It produced the following:
Probing IDE interface ide2...
hde: Hitachi XX.V.3.4.0.0, CFA DISK drive
ide2 at 0x100-0x107,0x10e on irq 10
hde: max request size: 128KiB
hde: 2002896 sectors (1025 MB) w/1KiB Cache, CHS=1987/16/63
hde: hde1
ide-cs: hde: Vpp = 0.0
Sure enough, I found a directory called /dev/hde1. By creating
directory /media/pccfcard and running "mount -t vfat /dev/hde1
/media/pccfcard" I had complete access to the cf card. I then added an
appropriate line to /etc/fstab, which I will test after the next time I
boot my laptop.
I would doublecheck the fstab(5) manpage to make sure you don't try to
automount any filesystem that you don't intend to have connected each and
every time the machine boots.
http://ursine.ca/cgi-bin/dwww?type=runman&location=fstab/5
It is interesting that the adapter manufacturer is identified as
Hitachi; whereas the adapter is labelled Sandisk.
That's actually not that unusual. Much (most?) hardware is manufactured by
one company, but distributed, labelled and sold as another brand.
I also noticed that pccardctl includes the commands insert and eject.
Since the cards can be hot inserted and removed, I wonder why have these
two commands.
Scripts that are automatically called when a device is inserted or ejected.
Just because it acts like magic doesn't mean it is. :o)
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