I see on my system (running 3.1 rc6) quite a lot of these in dmesg (complete dmesg attached): [27907.047446] ata3.00: exception Emask 0x40 SAct 0x1 SErr 0x880800 action 0x6 frozen [27907.047453] ata3: SError: { HostInt 10B8B LinkSeq } [27907.047457] ata3.00: failed command: READ FPDMA QUEUED [27907.047463] ata3.00: cmd 60/08:00:f0:1d:53/00:00:0b:00:00/40 tag 0 ncq 4096 in [27907.047465] res 40/00:00:40:fb:8c/00:00:14:00:00/40 Emask 0x44 (timeout) [27907.047468] ata3.00: status: { DRDY } [27907.047474] ata3: hard resetting link [27907.351451] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 310) [27907.353803] ata3.00: configured for UDMA/33 [27907.364380] ata3: EH complete Is my harddisk dying? I have two harddisks - which ones of these is it (sda or sdb)? This part of dmesg did not help me to identify which disk is ata3 and which ata4: [ 1.757441] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [ 1.757470] ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [ 1.758611] ata3.00: ATA-8: ST3750528AS, CC38, max UDMA/133 [ 1.758616] ata3.00: 1465149168 sectors, multi 16: LBA48 NCQ (depth 31/32) [ 1.758651] ata4.00: ATA-8: ST3750528AS, CC38, max UDMA/133 [ 1.758655] ata4.00: 1465149168 sectors, multi 16: LBA48 NCQ (depth 31/32) [ 1.759050] ata5.00: ATAPI: ATAPI iHAS124 Y, BL0V, max UDMA/100 [ 1.760038] ata3.00: configured for UDMA/133 [ 1.760065] ata4.00: configured for UDMA/133 [ 1.760224] scsi 2:0:0:0: Direct-Access ATA ST3750528AS CC38 PQ: 0 ANSI: 5 [ 1.760382] sd 2:0:0:0: [sda] 1465149168 512-byte logical blocks: (750 GB/698 GiB) [ 1.760415] sd 2:0:0:0: [sda] Write Protect is off [ 1.760417] sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00 [ 1.760420] scsi 3:0:0:0: Direct-Access ATA ST3750528AS CC38 PQ: 0 ANSI: 5 [ 1.760436] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO o r FUA [ 1.760505] sd 3:0:0:0: [sdb] 1465149168 512-byte logical blocks: (750 GB/698 GiB) [ 1.760533] sd 3:0:0:0: [sdb] Write Protect is off [ 1.760535] sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00 [ 1.760544] sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Andreas -- Andreas Jaeger aj@{suse.com,opensuse.org} Twitter/Identica: jaegerandi SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg) GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126