I have a Sonicwall TZ100 that my office staff members use to access our file server from their home machines. One iMAC/Snow Leopard user (and so far, only one) has been complaining for some time about 'freeze-ups' when accessing the file server through the Netextender-based VPN tunnel that comes with the TZ100 device. On Monday of this week, her iMAC failed to boot and when she took it to the 'geniuses' at the Apple Store in her area, was told that her hard drive had failed. The iMAC is a year old and still under warranty, but the 'genius' suggested that this was a consequence of the freeze-ups associated with the Netextender program. I am dubious that software conflicts leading to operating system lockups can cause hard drive failure. I will add that the user has subsequently told me that other programs besides Netextender have frozen at times, though she attributes more of them to times when she was connected to our file server through the Netextender VPN tunnel, and claims that the freezeups began only after Netextender was installed on her system. Since Netextender is such a small program, and doesn't produce freezeups on other Macs, I am dubious about the Apple Genius' diagnosis. I suspect a failing hard drive whose troubles happened to coincide with the advent of the Netextender installation. This is partly supported by the fact that I have at least one other user whose iMAC runs Netextender to the same TZ100 without freeze-ups. But if anyone knows of reasons to take the Apple Store Genius' diagnosis seriously, please let me know as I have more than one Snow Leopard user and don't want to imperil the integrity of their hardware.