Re: [PATCH] libata: blacklist NCQ on OCZ CORE 2 SSD

[Robert Hancock <hancockr@shaw.ca>]

Lubomír Bulej wrote:
> Hello,
> 
> thanks for the insight - I can only (somewhat) parse the simplest of ATA 
> errors related to bad sectors :-)
> 
>> The "applying bridge limits" part is interesting, that would imply the 
>> device's identify data doesn't properly indicate it's actually a SATA 
>> device so the kernel assumes it's a PATA device behind a SATA bridge. 
>> I don't think it's related to the problem but it does suggest that 
>> whoever designed the SATA interface on that thing probably didn't do a 
>> ton of validation on it..
> 
> It well may be, who knows - there is basically no detailed info on the 
> product. Is there a way to find out, apart from taking it apart and 
> taking a peek at the chips? :-)

Likely not, but it seems pretty much impossible that it is, if it 
reports NCQ support..

> 
> BTW, can the kernel assumption of "pata-behind-sata-bridge" cause any 
> problems?

It looks like all that does is limit the transfer rate to UDMA5 (which 
doesn't actually make any difference if it's really SATA) and limits 
maximum sectors per transfer to 200.

> 
> Anyway, I guess that's what we get when memory manufacturers (let's say 
> assemblers) start delving into persistent storage. I was a bit dazed by 
> the "oh so distinguishing" model name/number...
> 
> 
> Best regards,
> Lubomir
> 
>