how to check if hal is ready

[double-oh-viper]

Hello all,

Is there a possibility to check with hal if, for example an USB-stick, 
is completely
ready (for using)?

Reason is that I want to check if there are 2 (suitable) volumes 
available on the stick. If that is verified,
I can use the stick, otherwise, I cannot. The problem is that I can wait 
for both volumes, but I don't know
how long to wait if they are not available.

Maybe you can help me how to fix this.

Thanks in advance.

Peter