Как объяснить такие строчки лога

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Эти строчки лога появляются при загрузке ядра:
May 1 11:06:52 kernel: [ 3.959531] sd 9:0:0:0: Attached scsi generic sg3 type 0
May 1 11:06:52 kernel: [ 3.960028] sd 9:0:0:0: [sdc] 1250263728 512-byte logical blocks: (640 GB/596 GiB)
May 1 11:06:52 kernel: [ 3.960896] sd 9:0:0:0: [sdc] Write Protect is off
May 1 11:06:52 kernel: [ 3.960900] sd 9:0:0:0: [sdc] Mode Sense: 03 00 00 00
May 1 11:06:52 kernel: [ 3.961643] sd 9:0:0:0: [sdc] No Caching mode page present
May 1 11:06:52 kernel: [ 3.961780] sd 9:0:0:0: [sdc] Assuming drive cache: write through
May 1 11:06:52 gur-Aspire kernel: [ 3.964642] sd 9:0:0:0: [sdc] No Caching mode page present
May 1 11:06:52 kernel: [ 3.964767] sd 9:0:0:0: [sdc] Assuming drive cache: write through
May 1 11:06:52 [ 3.965404] sdc: sdc1 sdc2

Очень интересует природа вот этой строчки: May 1 11:06:52 kernel: [ 3.964767] sd 9:0:0:0: [sdc] Assuming drive cache: write through