[ubuntu-uk] SD card (reader) mysteries

[alan c]

TheVeech wrote:
> On Mon, 2007-04-30 at 16:12 +0100, alan c wrote:
>> I bought a multi card reader (external USB) some time ago for use with 
>> CF cards which I was using at the time. I have recently  begun using 
>> SD cards and the first ones were 16MB and 1GB SD.
>> 
>> The 16MB has always been recognised immediately via the card reader 
>> and kubuntu (6.06, 6.10, 7.04) but the 1GB cards are only recognised 
>> intermittently. In fact I had one replaced at the retail shop. The 
>> replacement did not get recognised either(!)
>> 
>> I now have additional 2GB sd cards and again they are sometimes 
>> recognised, but mostly not.
>> 
>> Same happens in 'doze XP, intermittent and unpredictable. Sigh.
>> 
>> I sort of conclude that the card reader is old technology and I need a 
>> newer one, which hopefully will handle larger SD better. (?)
>> 
>> It is not a question about mounting the card, it is simply not seen as 
>> a card device, although the card reader is shown ok in
>> lsusb.
>> 
>> The cards all work ok in their respective  units - a camera and DAB 
>> radios etc, and can be seen and downloaded via usb from their units, 
>> but not (usually) from the card reader.
>> 
>> I would be very interested in comments - SD standards seem to be a bit 
>> of a nightmare according to wikipedia.
>> -- 
>> alan cocks
>> Kubuntu user#10391
> 
> Are you sure enough power's being supplied to the USB card reader?  My
> WD Passport HDD and 2GB pen drive won't get recognised on my laptop with
> insufficient power, but my 256MB pen drive will.

Thanks, yes, one of the test machines is using an external powered usb 
hub - I also tried into the usb card directly on this, and a second 
machine.
-- 
alan cocks
Kubuntu user#10391