the catch: when there is no audio jack inserted ->

it will register as “audio output device” (usb-soundcard) by GNU Linux Debian X-D

making file access impossible

solution: attach a audio-jack cable:

then it will show up and mount like a usb-stick

another downturn of that (otherwise nice) product:

  • can not play audio while charging, making it unusable as a non-portable mp3-player for the user’s audio-rack
[ 9386.704504] scsi 5:0:0:0: Direct-Access     JIE LI   CD002-1          1.00 PQ: 0 ANSI: 0
[ 9386.705286] sd 5:0:0:0: Attached scsi generic sg2 type 0
[ 9386.709145] sd 5:0:0:0: [sdc] Attached SCSI removable disk
[ 9413.401912] usb 2-6: USB disconnect, device number 8
[ 9414.882954] usb 2-6: new full-speed USB device number 9 using xhci_hcd
[ 9415.032980] usb 2-6: New USB device found, idVendor=e2b7, idProduct=0811, bcdDevice= 1.00
[ 9415.032991] usb 2-6: New USB device strings: Mfr=1, Product=2, SerialNumber=1
[ 9415.032995] usb 2-6: Product: CD002
[ 9415.032999] usb 2-6: Manufacturer: CD002
[ 9415.033003] usb 2-6: SerialNumber: CD002
[ 9415.034368] usb-storage 2-6:1.0: USB Mass Storage device detected
[ 9415.034641] scsi host5: usb-storage 2-6:1.0
[ 9415.039161] input: CD002 CD002 as /devices/pci0000:00/0000:00:14.0/usb2/2-6/2-6:1.3/0003:E2B7:0811.0009/input/input19
[ 9415.099364] hid-generic 0003:E2B7:0811.0009: input,hidraw5: USB HID v2.01 Device [CD002 CD002] on usb-0000:00:14.0-6/input3
[ 9416.048534] scsi 5:0:0:0: Direct-Access     JIE LI   CD002-1          1.00 PQ: 0 ANSI: 0
[ 9416.049210] sd 5:0:0:0: Attached scsi generic sg2 type 0
[ 9416.052554] sd 5:0:0:0: [sdc] Attached SCSI removable disk
[ 9519.882463] usb 2-6: USB disconnect, device number 9
[ 9521.368568] usb 2-6: new full-speed USB device number 10 using xhci_hcd
[ 9521.518934] usb 2-6: New USB device found, idVendor=e2b7, idProduct=0811, bcdDevice= 1.00
[ 9521.518946] usb 2-6: New USB device strings: Mfr=1, Product=2, SerialNumber=1
[ 9521.518951] usb 2-6: Product: CD002
[ 9521.518955] usb 2-6: Manufacturer: CD002
[ 9521.518959] usb 2-6: SerialNumber: CD002
[ 9521.520485] usb-storage 2-6:1.0: USB Mass Storage device detected
[ 9521.520930] scsi host5: usb-storage 2-6:1.0
[ 9521.524648] input: CD002 CD002 as /devices/pci0000:00/0000:00:14.0/usb2/2-6/2-6:1.3/0003:E2B7:0811.000A/input/input20
[ 9521.584895] hid-generic 0003:E2B7:0811.000A: input,hidraw5: USB HID v2.01 Device [CD002 CD002] on usb-0000:00:14.0-6/input3
[ 9522.546517] scsi 5:0:0:0: Direct-Access     JIE LI   CD002-1          1.00 PQ: 0 ANSI: 0
[ 9522.547227] sd 5:0:0:0: Attached scsi generic sg2 type 0
[ 9522.550723] sd 5:0:0:0: [sdc] Attached SCSI removable disk
[ 9532.869731] sd 5:0:0:0: [sdc] 7774208 512-byte logical blocks: (3.98 GB/3.71 GiB)
[ 9532.877229]  sdc: sdc1 <- now it works X-D

alternatives: Open Source mp3 players?

looks nice and innovative 🙂

https://www.mattkeeter.com/projects/bumpy/

https://formlabs.com/blog/diy-open-source-mp3-player/

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