Hi Alan, Hi Justin,

Sorry, following up on old emails... I am behind as usual.

quoted

[632714.975844] ata1.00: status: { DRDY ERR }
[632714.975847] ata1.00: error: { IDNF }

IDNF - ID not found, usually these days means 'asked for a sector out of
range'

Justin, was this error provoked for example by you using a 'dd' command to 
try and read stuff past the end of the disk?  Because the md device driver 
should not try and do something like that.  The md device driver knows how 
many LBAs are available on the disk and should never issue a read or write 
past the end of the device.

Justin, I have the impression that this IDNF error was NOT due to you 
issuing dd commands or similar, but was part of 'normal' md operation.

Alan, am I overlooking something?  (One feature that might provide such 
errors is the 'host reserved address' set of commands that allow you to 
'clip' the disk capacity.)

Cheers,
     Bruce