I bought a NexStar MX dual SATA enclosure and two 1TB drives for it.
It has an internal switch to select it appearing as a single 2TB drive
or two separate 1TB drives. I eventually want it to be the single
drive, but I want it as two separate drives initially. However, it
doesn't work that way.
I have tried these combinations:
Both drives installed
Swapped them
One drive in each slot, the other slot empty
Both slots work, and both drives work. But with two drives installed
and the switch in individual drives mode, it only shows one of them.
These are SATA and there is no master / slave jumper to snag me,
AFAIK.
The instruction manual mkes a reference to the mode switch being
either JBOD or individual drives. They have a reference to RAID as a
comparison, but nowhere else in the manual do they refer to RAID, nor
does the box anywhere brag about RAID, and the installation procedures
for both Windows and Mac explicitly show two separate new drives. I
think it is safe to assume I should see either one 2TB drive or two
1TB drives.
I don't have either a Windows or a Mac to try this on, and I don't
particularly want to contaimnate my shiny new 1TB drives.
So here's my question:
Is there some feature of the USB spec that is not implemented under
Linux that would prevent one of the drives from showing up?
The kernel config does NOT set CONFIG_SCSI_MULTI_LUN, if that makes
any difference.
Here is /var/log/messages when I first inserted the USB connection:
Dec 16 12:13:14 bitroteo [575806.793193] usb 4-3: new high speed USB device
using ehci_hcd and address 6
Dec 16 12:13:14 bitroteo [575806.909127] usb 4-3: configuration #1 chosen from
1 choice
Dec 16 12:13:14 bitroteo [575806.910493] scsi2 : SCSI emulation for USB Mass
Storage devices
Dec 16 12:13:14 bitroteo [575806.910794] usb-storage: device found at 6
Dec 16 12:13:14 bitroteo [575806.910799] usb-storage: waiting for device to
settle before scanning
Dec 16 12:13:19 bitroteo [575811.909675] scsi 2:0:0:0: Direct-Access WDC WD10
EACS-00ZJB0 PQ: 0 ANSI: 2 CCS
Dec 16 12:13:19 bitroteo [575811.911024] sd 2:0:0:0: [sda] 1953525168 512-byte
hardware sectors (1000205 MB)
Dec 16 12:13:19 bitroteo [575811.911754] sd 2:0:0:0: [sda] Write Protect is off
Dec 16 12:13:19 bitroteo [575811.911761] sd 2:0:0:0: [sda] Mode Sense: 00 38 00
00
Dec 16 12:13:19 bitroteo [575811.911765] sd 2:0:0:0: [sda] Assuming drive
cache: write through
Dec 16 12:13:19 bitroteo [575811.912751] sd 2:0:0:0: [sda] 1953525168 512-byte
hardware sectors (1000205 MB)
Dec 16 12:13:19 bitroteo [575811.913500] sd 2:0:0:0: [sda] Write Protect is off
Dec 16 12:13:19 bitroteo [575811.913506] sd 2:0:0:0: [sda] Mode Sense: 00 38 00
00
Dec 16 12:13:19 bitroteo [575811.913509] sd 2:0:0:0: [sda] Assuming drive
cache: write through
Dec 16 12:13:19 bitroteo [575811.913519] sda: unknown partition table d
Dec 16 12:13:19 bitroteo [575811.923424] sd 2:0:0:0: [sda] Attached SCSI disk
Dec 16 12:13:19 bitroteo [575811.923691] sd 2:0:0:0: Attached scsi generic sg0
type 0
Dec 16 12:13:19 bitroteo [575811.924342] usb-storage: device scan complete
Here is the result of lsusb:
# lsusb
Bus 004 Device 013: ID 152d:2336 JMicron Technology Corp. / JMicron
USA Technology Corp.
Bus 004 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 003 Device 002: ID 047d:1020 Kensington
Bus 003 Device 001: ID 0000:0000
Bus 001 Device 003: ID 06a3:8000 Saitek PLC
Bus 001 Device 001: ID 0000:0000
# lsusb -v -s 4:13
Bus 004 Device 013: ID 152d:2336 JMicron Technology Corp. / JMicron
USA Technology Corp.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x152d JMicron Technology Corp. / JMicron USA
Technology Corp.
idProduct 0x2336
bcdDevice 1.00
iManufacturer 1 JMicron
iProduct 2 JM20336 SATA, USB Combo
iSerial 5 8DC88D10EAC8
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4 USB Mass Storage
bmAttributes 0xc0
Self Powered
MaxPower 2mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 6 Bulk-In, Bulk-Out Interface
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
can't get debug descriptor: Connection timed out
Device Status: 0x0001
Self Powered
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