What sort of error is this message about ?

[strandedinnz]

Hi there,

Can anyone confirm for me if this error message is about a defective disk or defective hardware (blu-ray drive)
It's from MakeMKV 1.6.8 OSX

Error 'Scsi error - HARDWARE ERROR:TRACK FOLLOWING ERROR' occurred while reading '/BDMV/STREAM/00004.m2ts' at offset '3268866048'
Error 'Scsi error - HARDWARE ERROR:TRACK FOLLOWING ERROR' occurred while reading '/BDMV/STREAM/00004.m2ts' at offset '3268866048'

Thanks

Mark
PS. Apologies if I posted 2 messages the same, think the internet ate the first post!

[crowfax]

Damaged/Defective/Dirty disc OR failing drive.