Confused with SATA
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From: KlausK on 16 Jan 2008 20:11 If I don't install SATA (AHCI) or RAID drivers during the O/S installation (by pressing F6), does it mean that my SATA controllers perform at a lower speed?!? Situation: 2 PCs running XP SP2 (one built with a Bad Axe 2 motherboard and the other with a Bad Axe). I knew not much about AHCI (didn't plan to RAID anyway), so I didn't think too much about HD controllers. Currently, SATA is configured as IDE in the bios when installing XP on both systems. Device Manager shows the Intel SATA controller. Benchmark: I have 4 Seagate SATA 3.0 HDs on both systems and got approximately 70 MB/s max and 170 MB/s burst rates. The numbers seem low compared with the SATA 3.0 specification. So, I guess my SATA controllers are underperforming....Any comments?
From: Rod Speed on 16 Jan 2008 22:07 KlausK <dinga(a)noone.com> wrote: > If I don't install SATA (AHCI) or RAID drivers during the O/S installation (by pressing F6), does it mean that my SATA > controllers perform at a lower speed?!? Nope, it doesnt affect the speed. > Situation: 2 PCs running XP SP2 (one built with a Bad Axe 2 motherboard and the other with a Bad Axe). I knew not much > about AHCI (didn't plan to RAID anyway), so I didn't think too much about HD controllers. Currently, SATA is > configured as IDE in the bios when installing XP on both systems. Device Manager shows the Intel SATA controller. > Benchmark: I have 4 Seagate SATA 3.0 HDs on both systems and got approximately 70 MB/s max and 170 MB/s burst rates. > The numbers seem low compared with the SATA 3.0 specification. They are for all drives. The specs are just the speed of the interface cable, and the benchmark speeds are for reading and writing data to the platters, and that is always much slower than the data can be moved over the cable. > So, I guess my SATA controllers are underperforming.... Nope, those numbers are fine. > Any comments? Wouldnt dream of commenting.
From: Arno Wagner on 17 Jan 2008 07:01 Previously KlausK <dinga(a)noone.com> wrote: > If I don't install SATA (AHCI) or RAID drivers during the O/S installation > (by pressing F6), does it mean that my SATA controllers perform at a lower > speed?!? Not typically. SATA does not have lower speeds than 150MB/s. It can mean, however, that your controllers do not work at all. > Situation: 2 PCs running XP SP2 (one built with a Bad Axe 2 > motherboard and the other with a Bad Axe). Bad Axe? > I knew not much about > AHCI (didn't plan to RAID anyway), AHCI is not RAID. It is the generic SATA controller driver, supported by many newer SATA controllers. > so I didn't think too much about > HD controllers. Currently, SATA is configured as IDE in the bios > when installing XP on both systems. Device Manager shows the Intel > SATA controller. If the BIOS supports IDE emulation, then you should be fine, unless you need SATA only features such as hotplugging. > Benchmark: I have 4 Seagate SATA 3.0 HDs on both systems and got > approximately 70 MB/s max and 170 MB/s burst rates. Entirely fine. > The numbers seem low compared with the SATA 3.0 specification. So, I > guess my SATA controllers are underperforming....Any comments? Interface transfer rates are not disk speeds. The interface allways needs to be faster than the disk in order not to be a bottleneck. To find out whether disk observed speed is fine, look into the disk datasheet for its performance numbers. 70MB/s sustained is a typical rate for a modern HDD. Arno
From: KlausK on 17 Jan 2008 09:41 "Arno Wagner" <me(a)privacy.net> wrote in message news:5v8ubuF1jfpu5U1(a)mid.individual.net... > Previously KlausK <dinga(a)noone.com> wrote: >> If I don't install SATA (AHCI) or RAID drivers during the O/S >> installation >> (by pressing F6), does it mean that my SATA controllers perform at a >> lower >> speed?!? > > Not typically. SATA does not have lower speeds than 150MB/s. > It can mean, however, that your controllers do not work at all. > >> Situation: 2 PCs running XP SP2 (one built with a Bad Axe 2 >> motherboard and the other with a Bad Axe). > > Bad Axe? > Bad Axe is a nickname for the Intel 975XBX motherboard. My HDD speed seems fine, compared with benchmark speeds posted on the Net.
From: Justin on 18 Jan 2008 00:46
KlausK wrote: > "Arno Wagner" <me(a)privacy.net> wrote in message > news:5v8ubuF1jfpu5U1(a)mid.individual.net... >> Previously KlausK <dinga(a)noone.com> wrote: >>> If I don't install SATA (AHCI) or RAID drivers during the O/S >>> installation >>> (by pressing F6), does it mean that my SATA controllers perform at a >>> lower >>> speed?!? >> Not typically. SATA does not have lower speeds than 150MB/s. >> It can mean, however, that your controllers do not work at all. >> >>> Situation: 2 PCs running XP SP2 (one built with a Bad Axe 2 >>> motherboard and the other with a Bad Axe). >> Bad Axe? >> > Bad Axe is a nickname for the Intel 975XBX motherboard. My HDD speed seems > fine, compared with benchmark speeds posted on the Net. > > I wish my BLKDP35DPM has a kickass name. I wonder if we can make one up? |