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I looked inside my 623 and I don't see any internal SD card in there, so the internal memory must be some kind of flash device soldered to the board. I think your best bet is to keep trying to resurrect the device rather than try to read the internal memory on another system. Perhaps the battery completely discharged before and it now must recharge at a very slow rate? You can try leaving it connected to USB while turned off for a day or two to see if it will come back to life on its own.
Maybe you can copy a firmware image onto an SD card, insert it into the device, and then push the power button while holding down the Next/Prev buttons to start a firmware update process. The device may be able to reboot after the firmware has been reflashed onto the device.
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