Hang

I'm using a new Macbook Pro which came pre-loaded with Leopard. when i install a usb HD it hangs and have to force a reboot. what this mean, thanks

??????

this is the error what do this mean?


Tue Apr 28 07:04:23 2009
panic(cpu 1 caller 0x003EB97C): "IOUSBDevice::_RESERVEDIOUSBDevice8 called\n"@/SourceCache/xnu/xnu-1228.9.80/libkern/c++/OSMetaClass.cpp:816
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x50f27a68 : 0x12b4f3 (0x45b14c 0x50f27a9c 0x1335e4 0x0)
0x50f27ab8 : 0x3eb97c (0x49c58c 0x5b5280 0x5b5280 0x8)
0x50f27ad8 : 0x5a64d4 (0x5bd118 0x8 0x50f27b08 0x3ece8f)
0x50f27af8 : 0x638b66 (0x8c11500 0x50f27b1c 0x50f27b28 0x3f0459)
0x50f27b28 : 0x6399ce (0x836a600 0x63eb14 0x6e9cba0 0x0)
0x50f27b78 : 0x412976 (0x836a600 0x8ce1f00 0x1 0x3ecd96)
0x50f27bd8 : 0x414219 (0x8ce1f00 0x836a600 0xfe1c3a0 0x6ee24a0)
0x50f27c58 : 0x413a7d (0x8ce1f00 0x6ea0b80 0x0 0xffffffff)
0x50f27ca8 : 0x414786 (0x8ce1f00 0x2 0x0 0x0)
0x50f27ce8 : 0x40e528 (0x8ce1f00 0x2 0x0 0x8ce1f00)
0x50f27d28 : 0x5a4c75 (0x8ce1f00 0x2 0x4 0x0)
0x50f27da8 : 0x7f1e3c (0x8c11500 0xcdc0780 0x1 0x1)
0x50f27dc8 : 0x7f1886 (0xcdc0780 0x1 0x1 0x0)
0x50f27e18 : 0x7f13f5 (0xcdc0780 0x5bd118 0x6e62d80 0x10001)
0x50f27e48 : 0x412976 (0xcdc0780 0x8c11500 0x1 0x3ecd96)
0x50f27ea8 : 0x414219 (0x8c11500 0xcdc0780 0x82ad5e0 0x7391420)
Backtrace continues...
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOUSBMassStorageClass(2.0.5)@0x637000->0x640fff
dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(2.0.6)@0x5ed000
dependency: com.apple.iokit.IOUSBFamily(3.1.5)@0x596000
dependency: com.apple.iokit.IOStorageFamily(1.5.6)@0x5c7000
com.apple.driver.AppleUSBComposite(3.0.0)@0x7f0000->0x7f3fff
dependency: com.apple.iokit.IOUSBFamily(3.1.5)@0x596000
com.apple.iokit.IOUSBFamily(3.1.5)@0x596000->0x5bdfff

BSD process name corresponding to current thread: kernel_task

Mac OS version:
9G2133