Originally Posted by Razultull
I'd say you'd have to be pretty irresponsible to get a virus on your Mac, I've been named for a while now (couple of years ) and have never had a security problem. Of course thats incredibly naive to say.
You really can't get a virus on OSX - OSX does not execute arbitrarily downloaded code. All applications need to be installed, either by installing a package, or by using the installer, or by using something like Vise. All applications require the user to Agree to the install, to permit sudo to allow the setting of the eXecute flag - the exact same scenario that *Nix systems have.
This does not preclude trickery or social engineering, of faking out something that would make the user actually allow the install to occur, or to fake the user into issuing sudo - but by definition, such an attack is malware and perhaps a trojan, but certainly not a virus.
Of course, 600 MB "updates" simply show that OSX suffers from a great deal of bloat, and that the system itself has become very unstable and requires massive updates to keep it running. Of course, Apple is becoming all-pro at issuing such things in order to make older machines operate poorly, forcing people to upgrade; or using such updates to include support for new devices, again, forcing people to upgrade their machines because they bought an iPad or something. Such things do not happen in the Windows world because device makers simply issue a driver, and generally will choose to support a wide array of OS versions, like Win7/Vista/XP as a minimum - while many devices will have drivers going back to Win98SE or even Win95...