Bootlog errors - whats happening? Why? Is it normal? Why/why not?

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1. What does it do below and is it normal - is it IPfire code that asks computer to read from CD-ROM drive - even though Ipfire is booting from a USB drive? 1.1 To me it looks like its trying to read or write something from some blocks from CD-Rom drive. But why does it try to do so? 1.2 And, where exactly does the command come from that asks that it should read/write from those specific blocks? 1.3 Does that command come from BIOS specifically that it shoudl read/write those specific blocks? 1.4 What data or file names do these blocks below contain? Buffer I/O error on device sr0, logical block 2096896 Buffer I/O error on device sr0, logical block 2096897 Buffer I/O error on device sr0, logical block 2096898 Buffer I/O error on device sr0, logical block 2096899 Buffer I/O error on device sr0, logical block 2096900 Buffer I/O error on device sr0, logical block 2096901 Buffer I/O error on device sr0, logical block 2096902 Buffer I/O error on device sr0, logical block 2096903 1.5 If this is some media error (bad block) - why does it happen on more than 6 different new USB flash drives? And why that place/area all the time? ----- sr0: CDROM (ioctl) error, command: cdb[0]=0x43 43 00 00 00 00 00 00 00 0c 00 sr: Sense Key : 0x4 [current] sr: ASC=0x40 ASCQ=0x0 sr 1:0:0:0: [sr0] Unhandled sense code sr 1:0:0:0: [sr0] Result: hostbyte=0x00 driverbyte=0x08 sr 1:0:0:0: [sr0] Sense Key : 0x4 [current] sr 1:0:0:0: [sr0] ASC=0x40 ASCQ=0x0 sr 1:0:0:0: [sr0] CDB: cdb[0]=0x28: 28 00 00 07 ff c0 00 00 02 00 end_request: I/O error, dev sr0, sector 2096896 Buffer I/O error on device sr0, logical block 2096896 Buffer I/O error on device sr0, logical block 2096897 Buffer I/O error on device sr0, logical block 2096898 Buffer I/O error on device sr0, logical block 2096899 Buffer I/O error on device sr0, logical block 2096900 Buffer I/O error on device sr0, logical block 2096901 Buffer I/O error on device sr0, logical block 2096902 Buffer I/O error on device sr0, logical block 2096903 sr 1:0:0:0: [sr0] unaligned transfer sr 1:0:0:0: [sr0] unaligned transfer sr 1:0:0:0: [sr0] unaligned transfer sr 1:0:0:0: [sr0] unaligned transfer sr 1:0:0:0: [sr0] unaligned transfer sr 1:0:0:0: [sr0] unaligned transfer sr 1:0:0:0: [sr0] unaligned transfer sr 1:0:0:0: [sr0] unaligned transfer sr 1:0:0:0: [sr0] Unhandled sense code sr 1:0:0:0: [sr0] Result: hostbyte=0x00 driverbyte=0x08 sr 1:0:0:0: [sr0] Sense Key : 0x4 [current] sr 1:0:0:0: [sr0] ASC=0x40 ASCQ=0x0 sr 1:0:0:0: [sr0] CDB: cdb[0]=0x28: 28 00 00 00 00 00 00 00 20 00 end_request: I/O error, dev sr0, sector 0 Buffer I/O error on device sr0, logical block 0 Buffer I/O error on device sr0, logical block 1 sr 1:0:0:0: [sr0] unaligned transfer --------- ---- 2. What doe this code/command do? "sr 1:0:0:0: [sr0] unaligned transfer" 2.1 From where to where is this transfer happening from? 2.2 Is the transfer happening from the computer and out to/thru network or internet? 3. What does this command do? 3.1 sr0: CDROM (ioctl) error, command: cdb[0]=0x43 43 00 00 00 00 00 00 00 0c 00 3.2 CDB: cdb[0]=0x28: 28 00 00 07 ff c0 00 00 02 00 3.3 cdb[0]=0x43 43 00 00 00 00 00 00 00 0c 00 3.4 CDB: cdb[0]=0x28: 28 00 00 00 00 84 00 00 04 00 3.5 cdb[0]=0x28: 28 00 00 07 ff c0 00 00 02 00 3.6 cdb[0]=0x43 43 00 00 00 00 00 00 00 0c 00 3.7 CDB: cdb[0]=0x28: 28 00 00 00 00 84 00 00 04 00 3.8 CDB: cdb[0]=0x28: 28 00 00 00 00 01 00 00 01 00 4. How many bytes or kb is 1 "logical block"? (when i check with gparted it reports in "sectors" and not "blocks") 5. What is the purpose of this 2-line command below? Is it normal that this is done? If so, why? ---- acer_wmi: Brightness must be controlled by generic video driver input: Acer WMI hotkeys as /devices/virtual/input/input6 ----------

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@martale

Hello, the kernel messages about 'sr0' (CD-ROM) drive are not totally normal: they indicate that the kernel is not able to read the CD-ROM disk, probably because it is corrupted (the CD-ROM disk, not the kernel!). So, instead of trying to boot from several USB keys, you should just remove the CD from the computer :) Answers: 1.1. When the kernel encounters a new block device (USB key, CD/DVD, HDD, etc.), it tries to extract some relevant information from it: vendor, product, serial number, partition table, and so on. 1.2. The command comes from the kernel itself: it is its goal to recognize the hardware and "talk" with him at low level. This is not specific to the Linux kernel; this is actually the purpose of any kernel (also windows's one). 1.3. See 1.2. 1.4. No idea. Seriously, how do you want one to know the data or the filename by just providing block numbers ??? If you want to know, you should use a forensics tool, as the CD seems to be corrupted. 1.5. Because the error doesn't come from the USB, but from the CD/DVD. ... 4. On CD, logical block size is normally set to 2048 bits. (sectors and blocks are the same). 5. This is not "command", this is information. The first one says what it says: "Brightness must be controlled by generic video driver", isntead of by the acer_wmi driver. The second one means your Acer keyboard (input) has specific hotkeys (see /sys/devices/virtual/input/input6 for details). Cheers, martale PS: this is not a Perl related project.

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