just brew it! wrote:
How does that explain why they are cheaper than internals now, in spite of including a case and power brick?
Some of it might be warranty length. While the now-being-phased-out WD Mybooks apparently have a 3-year warranty as the bare NAS drives, the newer and cheaper (at least MSRP) WD Elements seem to be only 2.
Some of it could be binning. For instance the 8TB HGST helium drives found in Mybooks were reported to run at 5400 rpm, while the HGST enterprise drives on which they are based run at 7200.
But I would guess the biggest factor is statistical modelling of failure rates across product lines. On average, consumer externals are likely only used occasionally instead of being in an always-on environment. This is related to the two points above in that fewer drives are RMAd and they can get away with putting lower binned drives that they would otherwise not have a market for.
In reality, most higher end platform drives relegated to external models are probably just as good as their enterprise counterparts (or at least, for my usage, I'd never tell the difference) . I guess I'll see if I'm lucky enough to keep believing this when mine arrive.