On 11/2/2017 2:35 PM, m.roth at 5-cent.us wrote: > John R Pierce wrote: >> On 11/2/2017 2:18 PM,m.roth at 5-cent.us wrote: >>> We have a fair number of SAS 3.5" drives, and yes, 10k or 15k speeds. >> those are internally 2.5" disks in a 3.5" frame. you can't spin a 3.5" >> disk much faster than 7200 rpm without it coming apart. >> > Sorry, that's incorrect. I have, sitting here in front of me, a > Dell-branded Seagate Cheetah, 600GB (it's a few years old) 15k 3.5" drive. if you take one of those apart, you will find ~63mm (2.5") disk platters inside, and an identical mechanism to the 2.5" 600GB 15000 rpm drive of the same generation, just sitting in a larger frame. -- john r pierce, recycling bits in santa cruz