Date: Thu, 01 Nov 2018 10:59:57 +0000 From: "Frank Leonhardt (M)" <frank2@fjl.co.uk> To: freebsd-hardware@freebsd.org Subject: Re: When is sataIII actually sataIII? Message-ID: <441037E6-67AD-49A9-9151-3F617A7AE1AE@fjl.co.uk> In-Reply-To: <032dec6a280136b4b80d77715b0b1b17@mail-on.us> References: <032dec6a280136b4b80d77715b0b1b17@mail-on.us>
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On 1 November 2018 05:14:35 GMT+00:00, spamless@mail-on.us wrote: >Hi all, >I picked out, and put together some hardware for a new FreeBSD >powered box. I chose a WD blue drive I knew was pretty zippy. >But I was quite disappointed to discover that FreeBSD wouldn't >support it @6Gb. >The following output from dmesg(8): >GEOM: new disk ada0 >ada0: <WDC WD10EZEX-75WN4A0 01.01A01> ACS-3 ATA SATA 3.x device >ada0: Serial Number WD-WCC6Y3CJCTDC >ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) >ada0: Command Queueing enabled >ada0: 953869MB (1953525168 512 byte sectors) > >My hardware supports it; both drive, and controller. Yet for >some reason FreeBSD will only *acknowledge* the capabilities. >Do I need to impose some quirk, or something. > >Thanks! That is saying it will do transfers at 300 Megabytes/second on the interface. You'll be lucky to get that from a WD desktop drive due to mechanical limitations. WD blues at 1Tb tend to do 125-150MBps tops, and the range released a couple of years back (2015?) seem slower than the previous generation, although the spindle speeds vary. 6G vs. 3G is only interesting talking to silicone drives or a SATA expander. But an interesting question - why does it say SATA2 instead of SATA3? -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
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