DetouR6734: I
hate 5200's with a passion.
Dark_art_: The most typical rpm rate fot HDD's are 5400, not 5200 :P
With that said, the rpm rating of a hard drive, has very little to do with speed. A modern high cache 5400rpm drive would spank a 10 year old 7200 in
overall speed. The rpm rating on hard drives is what I call "Supermarket number", like on a big store every thing has a number to justify the price.
HDD are freaking complex nowadays but to give a simple exemple: HDD work with spinning discs inside, like cd's but magnetical read instead of optical. Imagine 2 similar drives, one with 2 internal discs, the other with 4 discs, Assuming each disc can be read equally fast, the drive with 4 discs will be twice as fast, despite the rotating speed of the discs.
Want a few more stuff to throw in the mixture? Disc density, at the same speed a 500Gb internal disc is able to read 5x than a similar sized 100Gb disc.
The size of the internal discs, "quality" and bandwidth of the sensor, cache size, speed and efficiency, even the rated power consumption has a big influence on speed.
Rpm is the same on cars engines (who dont love cars analogies), they say absolutelly zero about engine acceleration, economy, drive ability, response or rely ability...
Crap I can go on all day long but the rant iss too big now.
Tldr: rpm rating of a drive is a old number with no meaning for us, end users. It was importand back in the day when HDD were much simpler.
Yeah, my mistake!
Sure yeah cache does play a part, But still i disagree in general with your post, yes, there are varying factors, but swapping between 5400, 7200 and 10k, there is a difference, sure it will likely be more than just an RPM number, but you wern't gonna get a Raptor that was slower than any other drive on the market, and every 5400 drive i used, was an absolute pain in the ass to deal with.
It was a good rule of thumb to go by, and for me still is, the money you save going for less unless you want terrabytes of storage just wasn't worth it.
Even on a storage drive i'd probably go for a faster drive, simply because if i needed to use it as a main, i wouldn't get the sudden urge to throw it out the window upon trying.