Some MMC memory cards do not work while e.g. CFC are just fine

[Jukka A. Ukkonen]

	Hi all,

	I have a USB attached multi slot memory card reader which I
	use with FreeBSD-4.11. It has worked just fine with CFC cards
	for ages. A while ago I managed to get it work briefly with
	the MMC card used in Nokia 9300 mobile phones.
	Later when I have tried the same physical MMC card again it
	refuses to co-operate, but the CFCs seem to work just fine.
	This does not seem to be a problem in the MMC itself because it
	still works fine with the phone.
	The MMC just no longer works with FreeBSD and multi slot reader.
	Is this a known symptom of some sort of a quirk missing in
	scsi_da.c or something similar?

	When I apply "camcontrol rescan 4:0:2" this gets logged to the
	system console...

da6 at umass-sim0 bus 0 target 0 lun 2
da6: <Zynet USB Storage-MMC I03A> Removable Direct Access SCSI-0 device
da6: 650KB/s transfers
da6: 122MB (250880 512 byte sectors: 64H 32S/T 122C)

	So, the MMC definitely is there, and it has been recognized.
	When I try to mount the thing...

		mount -p -t msdos /dev/da5s1 /USB/flash

	I get this...

(da6:umass-sim0:0:0:2): READ(10). CDB: 28 40 0 0 0 0 0 0 1 0
(da6:umass-sim0:0:0:2): MEDIUM ERROR asc:11,0
(da6:umass-sim0:0:0:2): Unrecovered read error
da6: reading primary partition table: error reading fsbn 0
msdos: /dev/da6s1: Input/output error

	WHat should I make of this? Do these symptoms ring a bell?
	Are there any hints what to try next? 


	Cheers,
		// jau
.---  ..-  -.-  -.-  .-    .-  .-.-.-    ..-  -.-  -.-  ---  -.  .  -.
  /    Jukka A. Ukkonen,                            Mawit Ltd, Finland
 /__   M.Sc. (sw-eng & cs)                    (Phone) +358-500-606-671
   /   Internet: Jukka.Ukkonen(a)Mawit.Com      (Home) +358-9-6215-280
  /    Internet: ukkonen(a)nic.funet.fi
 v     Internet: jau(a)iki.fi
        .---  .-  ..-  ...-.-  ..  -.-  ..  .-.-.-  ..-.  ..
+ + + + My opinions are mine and mine alone, not my employers. + + + +