Hi, That's something that has been bothering me for a while but I hadn't got to writing a question about it ... I can see a stream of the following errors on my desktop [233755.873770] sd 6:0:0:3: [sde] Test WP failed, assume Write Enabled [233755.886450] sd 6:0:0:3: [sde] Asking for cache data failed [233755.886455] sd 6:0:0:3: [sde] Assuming drive cache: write through [233807.297205] sd 6:0:0:0: [sdb] Test WP failed, assume Write Enabled [233807.309884] sd 6:0:0:0: [sdb] Asking for cache data failed [233807.309890] sd 6:0:0:0: [sdb] Assuming drive cache: write through [233859.059886] sd 6:0:0:3: [sde] Test WP failed, assume Write Enabled [233859.072563] sd 6:0:0:3: [sde] Asking for cache data failed [233859.072569] sd 6:0:0:3: [sde] Assuming drive cache: write through [233910.823178] sd 6:0:0:4: [sdf] Test WP failed, assume Write Enabled (continues infinitely) and also possibly related error when coming out of suspend state [233714.179445] ata1: link is slow to respond, please be patient (ready=0) [233718.792644] ata1: COMRESET failed (errno=-16) [233719.821109] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [233719.961354] ata1.00: configured for UDMA/133 [233719.980924] sd 0:0:0:0: [sda] Starting disk [233719.988158] PM: resume of devices complete after 11241.539 msecs [233719.988206] PM: resume devices took 11.240 seconds [233719.988207] ------------[ cut here ]------------ [233719.988211] WARNING: at kernel/power/suspend_test.c:53 suspend_test_finish+0x86/0x90() [233719.988212] Hardware name: Aspire M3920 [233719.988213] Component: resume devices, time: 11240 I'm currently running Ubuntu 12.04 using an upstream kernel 3.5. I'm not familiar with the scsi subsystem at all, but I can help anyone familiar with such problems with debugging - and hopefully solving - this problem. thanks Marcin -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html