On Friday, 30 May 2025 22:06:03 British Summer Time Dale wrote: > Michael wrote: > > You can transfer some data from a tmpfs and measure the speed. If it gets > > anywhere near 4.8 Gbit/s (600 MB/s) its a SATA 3. The delay in the kernel > > picking it up at boot may be related to its size, but I have no experience > > of such large drives to be able to confirm this. > > When I started reading your reply, I realized I had that drive in the > older external enclosure connected to my main rig. I'm not sure if it > is SATA 3 capable or not. I need to research the specs on that > enclosure. It works fine for running self tests tho. Anyway, I > connected it to my NAS box. On it, it reads at speeds that make me > think it is SATA 3. It's around 250MB/sec with hdparm -t which is > normal on most all my rigs.
I corrected my statement above, which referred to the max speed of SATA 3 interface rather than the drive itself. As Frank noted in real life the drive only achieves a fraction of this. Your 250MB/sec read rate is what you can expect. [snip ...] > I'm surprised by the speed of the OS drive tho. It is a SSD drive. > Anyway, as one can see, some drives are connected at SATA 2 and some at > SATA3. Now I noticed, the 4 drive set is connected to a PCIe card. The > three drive set and the OS drive is connected to the mobo itself. This > makes me wonder, is the mobo ports only SATA 2? I went and looked at > the manual that shows a block diagram and what is what. Sure enough, > the mobo ports are SATA 2 or 3GBs/sec. Well, that explains that. Aha! Yes, that explains it. > I can't believe that mobo is SATA 2 tho. I could have sworn it was SATA > 3. > > Dale > > :-) :-) I recall mentioning at the start of this thread you should check the MoBo's SATA port spec. ;-)
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