Lion very slow starting apps with Firewire 800 drive mounted. Any ideas?

Lion very slow starting apps with Firewire 800 drive mounted.
When my Firewire 800 drive is in sleep mode, when I start up an app like MS Excel or Addressbook. I get a spining wheel and a delay before the app launches. Any ideas? Never happened in 10.6.

Long shot: What format is the drive?
Regards
TD

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    Uncached Read 70.91 35.64 MB/sec [256K blocks]
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