Yes, some express cards require you power the card down from the little Card 
icon in the top right menu. 
This stops drawing power/info from the card before then ejecting it. 
Otherwise some cards do Kernal panic the machine. 
Better to do it that way generally anyway. 

Kind regards
Daniel

Sent from my iPhone 4s

---
Daniel Kerr
MacWizardry

Phone: 0414 795 960
Email: <daniel AT macwizardry.com.au>
Web: <http://www.macwizardry.com.au>

** For Everything Apple **

On 02/04/2012, at 4:30 PM, James / Hans Kunz <sad...@iinet.net.au> wrote:

> the drives & other fw equipment is unmount & disconnected before removing the 
> express card....
> James
> 
> SAD Technic
> U3 6 Chalkley Pl
> Bayswater WA
> Australia
> +618 9370 5307
> mob 0414 421132 (international +614 14421132)
> sad...@iinet.net.au
> http://www.members.iinet.net.au/~saddas/
> 
> Patience and perseverance have a magical effect before which difficulties 
> disappear and obstacles vanish.
> 
> On 02/04/2012, at 12:05 PM, Ronda Brown wrote:
> 
>> Hi James,
>> 
>> Did you first "unmount" / "dismount" the Drive?
>> 
>> Hot-Swap functionality enables you to connect and disconnect drives without 
>> having to power down your computer. 
>> This does not mean you can simply pull out a drive at any time; you must put 
>> away (“eject”, “unmount”, “dismount”) the drive volume.
>> 
>> Only after the drives are ejected (unmounted) is it safe for you to 
>> disconnect the drives or cables. 
>> If you do not follow this procedure, data on your drives may be corrupted.
>> 
>> Cheers,
>> Ronni
>> Sent from Ronni's iPad
>> 
>> On 02/04/2012, at 11:56 AM, James / Hans Kunz <sad...@iinet.net.au> wrote:
>> 
>>> hello Rob
>>> i did this hot swap & my macs (powerbook & macbook pro) died with a 
>>> multilingual message that i have to shut down & restart,
>>> the express card connects directly to the  processor/memory bus system
>>> may be it works fine if you can access a card menue and switch off the card 
>>> first & then unplug it
>>> James
>>> 
>>> 
>>> SAD Technic
>>> U3 6 Chalkley Pl
>>> Bayswater WA
>>> Australia
>>> +618 9370 5307
>>> mob 0414 421132 (international +614 14421132)
>>> sad...@iinet.net.au
>>> http://www.members.iinet.net.au/~saddas/
>>> 
>>> Patience and perseverance have a magical effect before which difficulties 
>>> disappear and obstacles vanish.
>>> 
>>> On 01/04/2012, at 10:23 PM, Rob Phillips wrote:
>>> 
>>>> Hi James
>>>> 
>>>> What's the issue with hot-swapping Express cards? I've just purchased 
>>>> one for an external e-SATA drive, and I never shutdown my Macbook.  Why 
>>>> should I?  Will this 'fry' the express card?
>>>> 
>>>> Rob
>>>> 
>>>> On 29/03/12 10:06 AM, James / Hans Kunz wrote:
>>>>> there are a number of express cards available, eg i use it to have 2 
>>>>> firewire400&  1 usb port more available, good for video/audio production, 
>>>>> the pci express card should only be connected/plugged in when the mac is 
>>>>> switched off
>>>>> 
>>>>> http://www.techbuy.com.au/p/153961/USB_PCI-EXPRESS_CARDS/Mukii/TIP-PU301CB.asp
>>>>> this link points to a pic of a card with usb ports
>>>>> 
>>>>> James
>>>>> 
>>>>> U3 6 Chalkley Pl
>>>>> Bayswater WA
>>>>> Australia
>>>>> +618 9370 5307
>>>>> mob 0414 421132 (international +614 14421132)
>>>>> sad...@iinet.net.au
>>>>> http://www.members.iinet.net.au/~saddas/
>>>>> 
>>>>> Patience and perseverance have a magical effect before which difficulties 
>>>>> disappear and obstacles vanish.
>>>>> 
>>>>> On 28/03/2012, at 8:11 PM, tom samson wrote:
>>>>> 
>>>>>> I have a Macbook Pro and there is a Card slot on the left side. It has 
>>>>>> never been used. My question is what could the best way be to use it. I 
>>>>>> am really thinking about plugging in a semi permanent sd card as a 
>>>>>> digital drive but the cards sit proud of the port So what else is there.
>>>>>> 
>>>>>> tom samson
>>>>>> -- The WA Macintosh User Group Mailing List --
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>>>> 
>>>> -- 
>>>> Associate Professor Rob Phillips
>>>> Educational Development Unit
>>>> Room 4.42 Level 4 Library North Wing, Murdoch University
>>>> r.phill...@murdoch.edu.au  Phone: +61 8 9360 6054  Mobile: 0416 065 054
>>>> Life member, Australasian Society for Computers in Learning in Tertiary 
>>>> Education
>>>> Fellow, Higher Education Research and Development Society of Australasia
>>>> Recent book: Evaluating e-learning: Guiding research and practice
>>>> http://www.routledge.com/9780415881944/
>>>> 
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