@Arthur: Thanks for the UDMA/33 hint. Seems to be the problem in my case - according to dmesg output: ----------- [ 35.648146] ata6: PATA max UDMA/133 cmd 0x1f0 ctl 0x3f6 bmdma 0xfc00 irq 14 [ 35.966465] ata6.00: ATAPI: HL-DT-ST DVDRAM GSA-4120B, A111, max UDMA/33 [ 36.138006] ata6.00: configured for UDMA/33 -----------
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