Originally Posted by ughosting
I'm not sure this would actually work on a VPS anyway, because they are all "Virtual Disks".
I think if you did something like dd=/dev/zero of=/somefilesomewhere bs=1024k count=1024 to write approx a GB of data, you would be able to tell from the throughput.
And that would only work if the provider wasn't overloading their servers otherwise; the speeds may be that of SATA.
If I had any doubt a provider was lying about which type of drive they were using, then I wouldn't sign up with them. The only time I would test is to check speed.