Some days ago, tired of not being able to use the devices fully, I've installed 
an extension SATA controller card based on the Sil 3114:
a similar problem showed up for some newly acquired SATA optical devices.

The problem seems to have disappeared after I've installed the extension
card on a PCI slot with a reserved IRQ.

As the on-board SATA controller shares the IRQ with other devices on the
motherboard, I'm asking myself if probably the problem is due to the ata
driver not working properly with ATAPI devices on a controller in such
configuration :/

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ATAPI devices malfunctioning
https://bugs.launchpad.net/bugs/231575
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