In the electronics world, we deal with stuff like the Capacitor Plague - which manufacturers such as Dell figure cost them $300 MILLION dollars. In the networking world, we deal with Cisco knockoffs - their switches and big routing gear help to make the Internet work. They will be happy to sell you legit-seeming gear at a bargain price. More serious would be the cloning of LSI HBA's (no handy link) or Intel ethernet cards. My favorite examples are FTDI and Prolific, makers of USB-to-serial chips that only cost pennies to produce. In particular, there is poor protection of intellectual property rights, and it is common to find one manufacturer cloning the product of another and undercutting on price. The consumer electronics market is largely driven by price, which has resulted in most stuff being produced in Asia, where labor is cheap, environmental regulations are often lax, and other factors favor production of cheap hardware. And sometimes really insidious bugs happen. FreeNAS and ZFS do all they can to keep your data safe. I know not everyone can implement a backup strategy like the above but if you can, you should consider it.
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