[mythtv-users] USB 2.0 Drive Performance Issues

Nick Morrott knowledgejunkie at gmail.com
Tue Apr 15 10:45:58 UTC 2008

On 15/04/2008, Drew Tomlinson <drew at mykitchentable.net> wrote:

>  I'm surprised this would affect playback as now recordings are on a
>  separate drive.  Maybe USB 2.0 requires more CPU than ATA drives with
>  DMA enabled?  Can anyone explain this behavior?  I'm just curious as I
>  still intend to install my other drives and move the external to SATA.

USB devices can use high levels of CPU during transfers. A DMA-enabled
ATA disk should only use minimal CPU. Also don't forget that whenever
you are playing back video or using MythWeb, the MySQL database is
being read at the same time. If performance still suffers when you
have your eSATA disk online (I'd guess it will be better than USB) and
it's due to disk I/O rather than CPU, you could move your database to
another spindle.

Nick Morrott

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