Re: [Dvdrtools-users] Re: [Fwd: Re: Is my MSI DR8-A2 broken?]

[Bryan J. Smith]

Svante Signell <address@hidden> wrote:
> The drive can only be mounted with Master/Slave straps set
> or in Cable Select. Are you proposing Cable Select here??
> I don't think so!

Now you're nitpicking.  ;->  I mean _never_ configure the
drive for slave.  Nearly all new ATA and ATAPI devices come
configured with a "slave" jumper option for legacy
compatibility, but default to a single device on its own
channel.  In legacy terms, this is "master" although there is
a difference between a single device and master device, but
most devices can detect if there is a slave on the same
channel.

> Can you explain the difference with file transfer between
> /dev/hda and /dev/hdb using DMA with writing a file on 
> dev/hdc to a burner at /dev/hdd using DMA then!  

No difference if they are on the _same_ channel.  They cannot
handle transfers simultaneously without resetting the bus as
each takes control.

If they are on different channels, say /dev/hda to /dev/hdc,
then the bus is setup *1* time (typically at initial boot)
and the drives copy to/from memory as transfers occur.

That's why it's much, much faster with *1* device per
channel.



-- 
Bryan J. Smith     Professional, Technical Annoyance                      
address@hidden      http://thebs413.blogspot.com
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*** Speed doesn't kill, difference in speed does ***