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Differences in SATA Modes...?

post #1 of 11
Thread Starter 
Just wondering what is really the differences in IDE and AHCI? And looking for best performance in fastest data transfer which im sure that Sata cables has alot to do with that as well, as far as those go.. recommendations on what is best for that? This is what i dont understand, i got a NV53 series Gateway laptop that has a rating of 6.9 on hdd data transfer when my desktop is 5.9 and has higher tech, would bios or drivers have anything to do with this? my laptop is set on AHCI from the start... i didnt notice that until i was trying to discover what makes this laptop able to transfer more data than my desktop...
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post #2 of 11
Does the laptop have a solid state drive?

Anyway, AHCI is the "Advanced Host Controller Interface" and it does provide some improved performance over IDE. But, that rating of 5.9 may not increase (the WEI is kinda silly anyway).

Another benefit of the AHCI is Native Command Queuing:

http://en.wikipedia.org/wiki/Native_Command_Queuing

However, if you switch over to AHCI, then Windows will have a BSOD upon bootup. To prevent this, you can set Windows up for AHCI before changing it in the BIOS (this is not my guide):


Change from IDE to AHCI Mode after Installation

Information: AHCI stand for Advance Host Controller Interface. AHCI is a hardware mechanism that allows software to communicate with Serial ATA (SATA) devices (such as host bus adapters) that are designed to offer features not offered by Parallel ATA (PATA) controllers, such as:
  • Hot-Plugging
  • Native Command Queuing (NCQ) -might improve computer/system/hard disk responsiveness, especially in multi-tasking environment
You can read more about AHCI mode HERE

Instruction: There is one way to fix this, although you need to have knowledge of registry editing.
The detailed steps from Microsoft website are as follows:
  • Exit all Windows-based programs.
  • Press [Win] + R or take the RUN option from the start menu.
  • Now type regedit there and press Enter Key to open up the Registry Editor Window.
  • If you receive the User Account Control dialog box, click Continue.
  • Locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\msahci
  • In the right pane, right-click Start in the Name column, and then click Modify.
IDE%20to%20AHCI.jpg
  • In the Value data box, type 0 [3 is default], and then click OK.
IDE%20to%20AHCI%20modify.jpg
  • On the File menu, click Exit to close Registry Editor.
  • Restart your computer
  • Go to BIOS and enable AHCI, Save & Reboot
  • Another restart will be required to finish the driver installation.

Alternatively

Just download this Reg File and double-click to implement AHCI on your Windows-based computer.
Just remember to do the BIOS switch as well when you reboot.

[[URL="http://www.ocztechnologyforum.com/forum/showthread.php?63273-*-Windows-7-Ultimate-Tweaks-amp-Utilities-*"]Source[/URL]]
Edited by TwoCables - 3/4/11 at 8:05pm
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post #3 of 11
Here...

IDE : Slow Drive Speed (ATA133 is the best you can attempt to see), no NCQ(Native Command Queing), No use of HDDs Cache, No Hot Plugging (Drive is regarded as old school 40 pin drive).

AHCI: SATA speeds (up to 6GB/s [with SATA3], NCQ, HDD Cache usage, Hot Plugging.
Edited by t0adphr0g - 3/4/11 at 8:16pm
post #4 of 11
Thread Starter 
Well get this, Either one i choose, i noticed a slight difference in data transfer not much.. used to do like average of 68-75mb/s now its doin 80-99mb/s but what i dont understand is, that is the same speed of data transfer i was doing on 3gb/s system, why isnt 6gb/s system not functioning to up that speed? and my laptop goes faster than that... it gets around 160mb/s, and this is the drive it has and its not solid state.. its WD Scorpio.. wd5000bevt 22zat0, the desktop has WD Black 640gb 7200RPM 64mb cache 6GBPS..
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post #5 of 11
Quote:
Originally Posted by sschevy010;12616381 
Well get this, Either one i choose, i noticed a slight difference in data transfer not much.. used to do like average of 68-75mb/s now its doin 80-99mb/s but what i dont understand is, that is the same speed of data transfer i was doing on 3gb/s system, why isnt 6gb/s system not functioning to up that speed? and my laptop goes faster than that... it gets around 160mb/s, and this is the drive it has and its not solid state.. its WD Scorpio.. wd5000bevt 22zat0, the desktop has WD Black 640gb 7200RPM 64mb cache 6GBPS..
The drive itself is the limiting factor. I mean, SATA 3 or not, the drive it still only able to go as fast as it is able to go. I mean, 6 Gigabits per second is 768 Megabytes per second. My Sandforce solid state drive can't even do half that!

But as for why the Scorpio is almost twice as fast as the Black, I don't know. But I bet that there is a logical explanation for it.
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Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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post #6 of 11
Not to hijack this thread, but to have a raid array you must have it set to raid mode in the bios, correct? Or can AHCI run raid also?
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post #7 of 11
Thread Starter 
for some reason i still think the cables has alot to do with the transfer speed, but yet, that WD Black goes same speed as the WD Blue i got.. Again, still wondering if its cause of cables that can be low quality and restricting the speed
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post #8 of 11
Quote:
Originally Posted by NewAtOCing;12616466 
Not to hijack this thread, but to have a raid array you must have it set to raid mode in the bios, correct? Or can AHCI run raid also?
Actually, RAID uses the AHCI (that is, "the Advanced Host Controller Interface"). wink.gif So, RAID mode enables the AHCI and then uses it.
Quote:
Originally Posted by sschevy010;12616479 
for some reason i still think the cables has alot to do with the transfer speed, but yet, that WD Black goes same speed as the WD Blue i got.. Again, still wondering if its cause of cables that can be low quality and restricting the speed
I thought you said that the Scorpio can go up to 160 MB per second.

Anyway, try different cables; swap them around. Experiment and see if anything changes. I guess you could be onto something.
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Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by NewAtOCing;12616466 
Not to hijack this thread, but to have a raid array you must have it set to raid mode in the bios, correct? Or can AHCI run raid also?

Dont worry about hijacking this thread, sharing information is the greatest thing we all have. Got a question just post it smile.gif and as far as Raid goes of AHCI? I dont know, it seems to me that they are 2 different subject in Bios
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post #10 of 11
Thread Starter 
Yeah scorpio does, but the differences is, Laptop the drives are directly to the motherboard, Desktop isnt.. you have cables between the 2..
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