[GTALUG] SSD wear leveling [was Re: Build critique request and the story behind it.]

[Russell]

On November 22, 2017 10:41:25 AM EST, lsorense at csclub.uwaterloo.ca wrote:
>On Tue, Nov 21, 2017 at 04:41:55PM -0500, Russell via talk wrote:
>> I've always found it a weird polyglot convention that ATA drives are
>mounted as /dev/sdx. I know that has to do more with historical
>convergence of increased ATA transfer rates with scsi parallelism, but
>it's still kind of confusing.
>
>Well given ATAPI is SCSI over ATA, and hence to support anything other
>than harddisks, you need to support SCSI commands, it seems like making
>ATA disk command just be another flavor of scsi in the kernel made
>sense.
>
>I am not sure how SATA fits in given SAS supports SATA but not the
>other
>way around.  I believe SATA still uses ATA commands, unless it is not
>a harddisk in which cases it uses SCSI through ATAPI as it did on IDE.
>
>I have seen suggestions that it makes more sense to think of /dev/sdX
>as storage disk X rather than scsi disk X.  Doesn't help for /dev/sg
>which is scsi generic, so we probably should just live with it and not
>worry about the naming as long as it works.
>
>Not like /dev/hdX ever meant IDE.  I believe it was used for IDE, MFM,
>and a few other types that are probably no longer supported.

The RLL modulation type is still hanging around in a couple of different formats for optical drives.  Found this out looking for a SATA 6 disc player.

>
>-- 
>Len Sorensen

-- 
Russell