Number of USB devices that can be connected

Hi,
On my MacBook Pro (just before the unibody and all USB ports on the same side), I have connected:
1- on the left USB port a 1 TB external HD
2- on the right USB a USB hub with 4 ports:
2-1- a 320 GB HD used for TimeMachine
2-2- a DVD drive
2-3- a printer
2-4- a mighty mouse
Sometimes the Mac doesn't detect the RIGHT side group, I have to disconnect and reconnect the hub up to three times to get my devices recognized by OS X: is this normal? is there a maximum of devices a MacBook Pro can handle?
Thanks
Replaced left by right of course, thanks Limnos

HI,
Try Resetting the PRAM
If that doesn't help, try Resetting the SMC
If that doesn't help either, run the Apple Hardware Test just in case.
Carolyn

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