An ode to the 10,000 RPM Western Digital (Veloci)Raptor

Post by baybal2 » Sat, Oct 30, 2021, 10:37 PM UTC

guerby wrote: post #54

pengaru wrote: post #23

Earlier quoted context omitted.

20k rpm is relatively clunky F1 combustion engine territory. I find it hard to believe spinning an electric motor and a relatively light and small disc that fast is much of a challenge to keep together, especially in such a coddled environment. Even back in the early 90s my RC10 had a 38k rpm "modified" motor; the Motown Missile. That thing lived through hell...

Tesla Model S Plaid electric motor is said to reach 20k RPM but needs to be carbon-sleeved: https://www.reddit.com/r/teslamotors/comments/o4k0xa/up_to_2...

Post by [deleted] » Sat, Oct 30, 2021, 11:04 PM UTC

Post by pengaru » Sat, Oct 30, 2021, 11:33 PM UTC

jquery wrote: post #52

pengaru wrote: post #40

Earlier quoted context omitted.

> F1 engines are rebuilt after every race. Even if what you said were true, so what? We're talking about a tiny spinning disc on a brushless hub motor. There's basically a single moving part, maybe a few more if riding on ball bearings. Do you have any understanding of what is going on inside a many-cylinder internal combustion piston engine spinning at 20k rpm? We can view the flywheel as the hard disk platter equiv…

You're underselling what HDDs do. The seeks they have to do are so precision, if you made the hard drive the size of the earth, the "head" would still only be a couple meters from the ground and it would have to go any square meter on the entire earth in 1/100 of a second. It's absolutely incredible that the tiny SATA bay in my computer holds an 18TB drive. That's 18 * 8 trillion bits of data, or if the hard drive ha…

Post by HPsquared » Sun, Oct 31, 2021, 12:05 AM UTC

ggreer wrote: post #58

serf wrote: post #51

not much around that's as satisfying sounding as starting up a big full-size ATX case crammed with raptors. starting up a big lathe or mill spindle, or maybe a large phase converter with a heavy lever switch come close, but they don't scratch that "i'm in a super computer lab" itch as much as the fantastic whir of a raptor RAID. utilitarian feature : you could hear a bad sector from anywhere in a large room.

The motors in a Tesla can go up to 18,000rpm (20,000rpm in the carbon-wrapped Plaid motors). They sound pretty cool when you floor it.[1] Though once you pick up speed all you can hear is wind noise. 1. https://www.youtube.com/watch?v=_Rg75JbVOpg

Post by CamperBob2 » Sun, Oct 31, 2021, 12:38 AM UTC

linker3000 wrote: post #55

serf wrote: post #51

not much around that's as satisfying sounding as starting up a big full-size ATX case crammed with raptors. starting up a big lathe or mill spindle, or maybe a large phase converter with a heavy lever switch come close, but they don't scratch that "i'm in a super computer lab" itch as much as the fantastic whir of a raptor RAID. utilitarian feature : you could hear a bad sector from anywhere in a large room.

I used to work for HGST (now absorbed into WD) in the EMEA Enterprise Support lab. My main role was setting up PoC/testing systems, and support for high capacity SAS/helium drives, although I mostly worked with high-capacity flash boards and arrays. The 15K rpm drives could sometimes be quite noisy; especially with 48 or more in an array. Three of the engineers with whom I worked specialised in disk failure analysis;…