mine shorter output from syslog (long-one is in your /pm)
2016-12-17T16:15:19+01:00 err kernel[]: [ 4599.859189] ata2: softreset failed (1st FIS failed)
2016-12-17T16:15:19+01:00 warning kernel[]: [ 4599.864113] ata2: limiting SATA link speed to 1.5 Gbps
2016-12-17T16:15:19+01:00 info kernel[]: [ 4599.864119] ata2: hard resetting link
2016-12-17T16:15:24+01:00 err kernel[]: [ 4604.868963] ata2: softreset failed (1st FIS failed)
2016-12-17T16:15:24+01:00 err kernel[]: [ 4604.873859] ata2: reset failed, giving up
2016-12-17T16:15:24+01:00 warning kernel[]: [ 4604.877877] ata2.00: disabled
2016-12-17T16:15:24+01:00 info kernel[]: [ 4604.877897] ata2: EH complete
drives are having jumpers to limit speed to 1.5G