When plugged in, you get this in /var/log/messages
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Sep 24 17:28:59 localhost kernel: Vendor: Thomson Model: RD1080 Player Rev: 0.01
Sep 24 17:28:59 localhost kernel: Type: Direct-Access ANSI SCSI revision: 02
Sep 24 17:28:59 localhost kernel: SCSI device sda: 249344 512-byte hdwr sectors (128 MB)
Sep 24 17:28:59 localhost kernel: sda: assuming Write Enabled
Sep 24 17:28:59 localhost kernel: sda: assuming drive cache: write through
Sep 24 17:28:59 localhost kernel: sda:end_request: I/O error, dev sda, sector 249336
Sep 24 17:28:59 localhost kernel: Buffer I/O error on device sda, logical block 31167

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When trying to mount, you get an I/O error.
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I spent several hours searching online for a way to get this to work, but to no avail. After purchasing another MP3 player (Rio Forge Sport) that works fine, I suspect that the RCA Lyra just doesn't work under Linux, period.

Haven't gotten the internal 128 MB to work, but an external 256 MB card works perfectly mounted as /dev/sda1. So it's more or less linux compatible, just need to buy a card.

Maybe you want to take a look at :

http://usbat2.sourceforge.net/