Now if ya take that same exact physical drive and use it in a server environment, it will have a different firmware and it will not have the head parking "feature". in which case you hopefully didn't cheap out in your HD selection. A typical consumer drive might see as much as 25 - 50,000 parking cycles per year.maybe as much as 100k for an enthusiast box. When the HD is idle or with writes being in RAM or to the HD cache, the head will move to the parked position. Consumer HDs are rated for between 250k and 500k parking cycles. When the heads are parked, no damage will occur from the vibration. when ya dog, napping under ya desk jumps up when the doorbell rings. The feature serves well in a consumer an office environments in instances for exqample, a colleague bumps ya desk when carrying a box of copy paper, or plops it on your desk while loading the machine. What this means is that when the HD is not in use, the head is moved "off platter" and "parked". Many consumer drives include a feature called head parking. How many people would bother to read an article "here's the latest scoop on reliability of devices when installed in direct conflict with manufacturer's specifications? When you place consumer drives, which features such as "head parking" and the manufacturer advises not to use any drives with this feature in a server environment, the data is irrelevant. When a server farm is a series of PC cases on flimsy shelving with the drives held in place by rubberbands the data is irrelevant. When a "source" takes consumer dives and puts them in a service contrary to manufacturers recommendation the data is irrelevant. any discussion of backblaze in relation to consumer drives is simply irrelevant.
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