This device needs 2 luns and has been known working (options scsi_mod max_luns=2) for a very long time Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: eUSB Model: Compact Flash Rev: Type: Direct-Access ANSI SCSI revision: 02 Host: scsi0 Channel: 00 Id: 00 Lun: 01 Vendor: SCM Micr Model: eUSB SmartMedia Rev: 0208 Type: Direct-Access ANSI SCSI revision: 0 Bus 001 Device 008: ID 04e6:0005 SCM Microsystems, Inc. eUSB SmartMedia/CompactFlash Card Reader Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 16 idVendor 0x04e6 SCM Microsystems, Inc. idProduct 0x0005 eUSB SmartMedia/CompactFlash Card Reader bcdDevice 2.08 iManufacturer 1 SCM Microsystems Inc. iProduct 2 eUSB SmartMedia / CompactFlash Adapter iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 39 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 3 Vendor Class bmAttributes 0x80 MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 3 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 1 bInterfaceProtocol 1 iInterface 4 CBC Interface Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type none Usage Type Data wMaxPacketSize 0x0040 bytes 64 once bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type none Usage Type Data wMaxPacketSize 0x0040 bytes 64 once bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x83 EP 3 IN bmAttributes 3 Transfer Type Interrupt Synch Type none Usage Type Data wMaxPacketSize 0x0002 bytes 2 once bInterval 32 Language IDs: (length=4) 0409 English(US)