A method, apparatus and program storage device for providing geographically isolated failover using instant RAID swapping in mirrored virtual disks are disclosed. The guide member can be magnetically responsive to an externally applied magnetic field, or can be magnetically responsive to an externally applied magnetic field when a magnetic medical device is in the passage, andor it can be mechanically responsive. The system input is also supplied to a pilot signal cancellation system for removing a global pilot signal. The elastic member 12 is a spring of great length including a plurality of turns 15 wounded about a centre 16. Also, PXLEDs formed from GaN have a low surface recombination velocity and hence a high efficiency. A speed detecting device is fitted on the functioning section and detects the speed of the vehicle from predetermined direction.