On Thu, Nov 01, 2007 at 06:50:59PM -0400, Chris Zakelj wrote:
> Picked up a USB to serial converter on the way home from the office.  
> Here's a complete installation attempt using the 4.2 i386 CD:
>

....

> Let's install the sets!
> Location of sets? (cd disk ftp http or 'done') [cd]
> Available CD-ROMs are: cd0.
> Which one contains the install media? (or 'done') [cd0]
> cd0(atapiscsi0:0:0): Check Condition (error 0x70) on opcode 0x28
>    SENSE KEY: Media Error
>     ASC/ASCQ: ASC 0x11 ASCQ 0x06
> cd0(atapiscsi0:0:0): Check Condition (error 0x70) on opcode 0x28
>    SENSE KEY: Media Error
>     ASC/ASCQ: ASC 0x11 ASCQ 0x06
> cd0(atapiscsi0:0:0): Check Condition (error 0x70) on opcode 0x28
>    SENSE KEY: Media Error
>     ASC/ASCQ: ASC 0x11 ASCQ 0x06
> No filesystems found on cd0
> Location of sets? (cd disk ftp http or 'done') [cd]

ASC/ASCQ 0x11/0x06 would appear to mean "CIRC Unrecovered Error".
These values are listed in /usr/src/sys/scsi_base.c, line 1207 and
following. The error text is left out of install kernels to save
space.

Some random Googling gave me

"A CIRC unrecovered data error is defined as a block for which the
CIRC based error correction algorithm was unsuccessful on all read
attempts up to the read retry count. Layered error correction was
not used."

at

http://www.t10.org/ftp/x3t9.2/document.89/89-108r0.txt

Obvously our read retry count is 3 in this case. I don' know if
the other OS's you tried have larger values and eventually
succeeded, or if they just didn't happen to hit the same block. But
it looks like an inability to read a particular block from that CD
on that system.

.... Ken

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