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Why 2.5 in and 3.5 in drives are not that size?

Murilo_A
By Murilo_A
in Storage Devices
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Not something really important, but curious, 2.5 inches drives, are actually 2.75 inches and 3.5 inches drives are 4 inches, the only explanation I can think off, it's because it's easier to say 2.5 than 2.75, but that wouldn't apply for 3.5, because they are 4. Does anyone have an idea?

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1 minute ago, wrathoftheturkey said:

It's the size of the platter itself, so add the casing and you get the total length

Never though of that, makes sense

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1 minute ago, wrathoftheturkey said:

took a quick google search

What did you search for? I didn't find it

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