Is raid good for anything or faster using 2 different harddisks?

I have raid on my msi kt3ultra2, should I make use of it? is it any faster if I put my second hd on it?
Both hd's are splitted into two and each server their purpose, so I have no intention of running two identical systems.

Hi Danielsan,
RAID only comes faster when you set 2 identical HDD as an array for RAID 0. If you're using 2 different HDDs, the different performance for each HDD may impact the performance of the RAID 0 to even worse than a single drive performance.
If you have critical data and want instant backup, RAID 1 serves you well where the data is 100% mirrored on the 2nd HDD. This RAID 1 does not provide any performance edge as RAID 0 though.
You can also use the IDE3 and IDE4 for single drive operation with some workaround.
Some would suggest to use modded BIOS (which void the warranty) to flash Ultra ATA133 controller to the BIOS and lose RAID function, then you can use both IDE3 and IDE4 for single drive and even optical drives.
Basically that's all you can get from the RAID IDE3 and IDE4 on the board.

Similar Messages

Is the i7 13" MacBook Air good for me if I use...

Trying to see if a MacBook Air would be good for me if I use:
-Photoshop, iPhoto, and other photography apps from the Mac App Store? (I just recently picked up a DSLR to get into for photography so I imagine I'll be using these programs frequently)
-Vuze
-Handbrake (how long does it usually take for an Air to rip a DVD?)
-Casual Gaming (The most intensive game I'm looking at is Grand Theft Auto: San Andreas. Can the air run it?)
-Mail
-Internet (some online videos, etc)
With all these uses, would a i7 13" MacBook Air be able to handle all these tasks for me and perform them all reasonably well?

Smiller,
I think the hesitation to answer comes from the fact that a good portion of your questions are at least somewhat subjective. I have the 13" i7 4 GB x 256 GB MBA, and I find the unit perfectly satisfactory performing most of the task you mention. However, I don't do all of them, all the time either. It's been a couple of months since I ripped a DVD, and I didn't time it. I think it took me an hour and a half to rip a two hour movie. On my MacBook Pro, which I recently sold, it maybe would have taken a bit over an hour to perform the same task.
Then again, for most of my tasks that I do everyday, the MBA would edge out the MBP. The SSD makes a big difference for certain tasks. Albiet, you could equip an MBP with an SSD and the advantage in certain cases would disappear, and the MBP would reign in all cases, except of course portability.
For your photo, internet, bit-torrent work you will probably find the MBA perfectly suited, provided the screen size is adequate for your taste. You see, we then again run into a subjective area.
What can I say, go to an Apple Store and give it a whirl. Find out first hand.

Is it good for eight graders to use for school?

Is the ipad good for eight graders to use for school?

Find out what software your school is using or supports.
buy device that runs that software.

After I backed up and restored my device I cannot open the app (Good for Enterprise) that I use for my work email??

After I backed up and restored my phone I cannot open the app I use for my work email (Good for Enterprise)? It opens and immediately shuts down.

did you try deleting the app and reinstalling it?

I have two iPads and giving one to my grandson. Using my Apple id for both, can we use different passwords to access our "own" apps. Also I don't want the downloaded App to go to both iPads. Been looking for hours for an explanation! Thanks for any help.

I have two iPads and giving 1st gen. to my grandson. Using my Apple idI for both... can we use different passwords to access our "own" apps. Also I don't want the downloaded App to go to both iPads. Been looking for hours for an explanation! Thanks for any help.

Look at this link.
Giving your former iPad to a spouse or family member: the quick guide
http://www.tuaw.com/2012/03/17/giving-your-former-ipad-to-a-spouse-or-family-mem ber-the-quick/
How to Share a Family iPad
http://www.macworld.com/article/1163347/how_to_share_a_family_ipad.html
Using iPhone, iPad, or iPod with multiple computers
http://support.apple.com/kb/ht1202
iOS & iCloud Tips: Sharing an Apple ID With Your Family
http://www.macstories.net/stories/ios-5-icloud-tips-sharing-an-apple-id-with-you r-family/
How To Best Use and Share Apple IDs across iPhones, iPads and iPods
http://www.nerdsonsite.com/blog/2012/06/07/help-im-appleid-confused/
 Cheers, Tom

Is finally good for anything?

Perhaps I'm missing something, but as I perceive it, the "finally" clause of a try/catch block has no purpose?
In every case I can imagine, it could be removed entirely, the code encapsulated within instead pasted after the block, with no change in the actual code execution.
What am I missing?

I don't really understand. I'll try an example.
try
{ someCode();
catch ( someException e )
{ someOtherCode();
finally
{ someFinalCode();
someOtherFinalCode();My assertion is : in all cases where someFinalCode()
executes, someOtherFinalCode() also executes.
Is there any case where this is not true?
Got tired of this argument a long time ago... but think of the example of when it:
a) throws an exception which you are not catching (your method can throw the exception back to its caller instead of handling it there, or throws an unchecked exception)
b) has a return statement inside the finally block which gets executed

Good issue on production ordre using different serial number

Hi expert,
I have a production order with several serial number of FG to be manufactured.
Material with batch number have been assigned and reserve for the production order.
I would like to perform a good issue of raw material with batch number and dispatched to the different serial number generated.
Do you have any idea to do it?
Best regards
Martial

hi,
We have use serial management as follwoing ,Pl. tally whether u suit it.
for traceability,We have maintain serial number profile into material master for FG & SFG materials,
During order confirmation,sytem allow to confirm the order ,but SFG with serial no. profile not gets consumed,
for that we use MB1A movement type 261 with input order number ,enter serial no. for the component & save.
we could later easily trace the component consumption through MB51 261 document for that particular material.
Regards,
Devendra

What is a good drumpad ipad app to use with Logic?

Is it possible to use a drumpad ipad app with Logic to create drumtracks? And if so, which app would be good for this?
Andre

I use the OWC, http://www.macsales.com Mercury Elite Pro external drives but they may seem large to use as portable drives.
My daughter has a very small 2 TB Western Digital My Passport for Mac that she has been using for a lot of travel and works great.

What is reflection good for?

i heard people use reflection with rmi, but what it is good for?
if i use reflection to figure out what methods etc a class has, how do i know what they do?

Oh cool, you just gave me an idea!
Storing bean class names in a db and upon retrieval of any name, a single utility can construct an entire GUI editor panel for any variety of java bean conforming to the Java Bean specifications. This way, if ever I want to add a new Panel to an application for a new module or set of features, all I would hypothetically have to do is create the bean and add the name to the db and load up my app without even having to create the new GUI interface for editing it.
thanks!
Oh and one other additional thing reflection is good for, is interfacing with XML config files using the attribute names as identifiers for locating the setters (E.g., Spring Framework) as well as a bunch of other related XML things.
Your imagination is your only limit. I would excercise caution in where and how you use it though. Usually best to use in initialization routines rather than runtime functions or during exhaustive processes.

I am using ethernet and am using a Linksys SE1500 5- port fast etherner switch, i cant seem to sign in on the apple for anything although I have accounts set up in itunes/apple and netflix . Any suggestions PLEASE have spent 3 hours argh. thanks

I am using ethernet and am using a Linksys SE1500 5- port fast etherner switch, i cant seem to sign in on the apple for anything although I have accounts set up in itunes/apple and netflix . Any suggestions PLEASE have spent 3 hours trying everything I can think of. Any help will be appreciated!
I have a linksys router but it isn't strong enough to get to this computer, so we are using ethernet.
Thank you
Colleen

Welcome to the Apple Community.
Are you getting any messages about date and time.
Have you tried restarting the Apple TV by removing ALL the cables for 30 seconds.
Are you connected to the network correctly.

Creating the best RAID setup for my MacPro using FCP

I have a MacPro, 2 x 3GHz Dual Core, 16GB ram, 4 x 500GB drives and I work in FCP 5.1.4 and with my Hardware setup I feel it should be faster and I've been wanting to set up a RAID but not sure how to do it, or the best way way to do it.
Out of the 4 drives I have, Drive one is my main drive (boot drive, apps etc.) Drives (2 & 3) which is a TB combined, I'd like to turn those into a RAID) to speed up rendering, editing etc. In FCP and Motion. Drive 4 is where I keep all my working files.
My files are backed up regularly onto external harddrives and kept offsite.
Can I leave everything I have on my entire system the way it is and just turn Drives 2 & 3 into a RAID that's best for this application? People who work in VIDEO I know do this all the time to speed things up but I can't find the steps for the best way to do this. Bits and pieces all over the place but I can't put this puzzle together.
Can you point me in the direction in how to do this?
As I'm doing this is there anything I should be careful about?
Please help me understand this process.
Just in case you need to know what kind of drives I have here's the info:
Capacity: 465.76 GB
Model: ST3500641AS P
Revision: 3.BTA
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk1
Bay Name: "Bay 1"
OS9 Drivers: No
S.M.A.R.T. status: Verified
Volumes:
Startup Drive:
Capacity: 465.44 GB
Available: 367.86 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk1s2
Mount Point: /

My advice would be 'yes' to what you are saying... with the exception of the Softraid stuff - not that I think its wrong, but I've never used it, so I can't comment if you need it or whether the Mac OSX raid is sufficient - but others here say they prefer it so fair enough. You can see some comparisons here http://www.amug.org/amug-web/html/amug/reviews/articles/softraid/351/
amug always have indepth benchmarks of stuff.
I wouldnt call myself an FCP guru, but I think that your suggestion of putting the FCP scratch disk and client, video files on the raid are the best idea. The scratch folder is essentially where the temp-rendered clips go, so its audio and video - you want that folder to be on a really fast volume. You also want your source video files to be on a really fast volume, so they can be streamed fast enough to play in realtime too when playing unrendered areas, or building a preview.
Some might say in FCP you get bast performance when your scratch disks and video files are on seperate disks. Thats totally true, so it can read from one disk and write to the other at the same time. But in your case you have a 3disk stripe, which is roughly 3x faster than either of your disks! So it would still be faster to have them all on the same stripe.
You can leave your FCP app on the sys drive, keeps things cleaner (drive1 for sys and appsm raid for data). You can keep your project files where ever you want, they're not very big and are kept in memory so dont affect performance at all. Though to stay clean I would keep it on the raid, so again the raid is for data, and you can back it up accordingly. The system drive is only for apps and system so you can back that up accordingly too (less frequently probably).
P.S. Technically your 'point 8' is inaccurate. After creating the raid you will not see drives 2,3 or 4. You will see only one 'volume' for all 3 drives. Overall your mac will have 2 'volumes': the system drive, and the stripe of 2,3,4. Physical drives and 'volumes' that mount in your OS are completely seperate. You can create multiple partitions in a single drive, or you can combine multiple drives into a single volume (e.g. using raid). But basically yes, you copy your client files back to the raid.
And remember, if any ONE of the disks in the stripe dies, you lose ALL of the data on the entire 1.5TB volume. So it is pretty important to backup regularly!!!!
(I dont wanna confuse you any more, but raid5 is a good option if you want more security and don't mind paying extra :P, you'll need more hardware for that, and more drives to make it worthwhile - but I would say skip that for now, as you can build your raid0 for free or almost free and use that until you think you need more)

How do I use WD Raptor for OS/Apps drive and RAID 0 for Home/Data drive

So far I have configured my machine with a WD Raptor 74GB as the startup disk, and created a RAID 0 with the Seagate 250 GB drive (shipped with the machine) and a 250GB partion of a WDC 320GB drive. All drives were zeroed and I used the install disks to load Tiger on the Raptor. I backed up to a LaCie D2 1TB external hard drive with LaCie's Silverkeeeper.
I would like to use the WD Raptor as startup/apps/scratch disk and the RAID 0 for the user folders and other data. I would then like to create a RAID 1 with the RAID 0 and a 500GB partion of the LaCie 1TB external.
I have learned however that what I would like and what I can have are not always compatible.
My questions:
Is the Silverkeeper backup sufficent, or should I have cloned my previous system?
What folders should accompany the application folder on the Raptor? So far I have only put the app folder there and nothing works. I suspect things like 'application support' should be there as well.
Is there a way to keep my home folder on the RAID 0 without using Terminal or spending too much time as the root user? I tried copying my home folder onto to the RAID 0 and putting an alias in the user account I had to create while installing the OS on the Raptor. This kind of works but is not a particularly elegant solution.
I would appreciate any advice on how to proceed or if the proposed configuration is even achievable.

Photoshop files of 1GB+ can eat up memory and scratch. And the more drives for scratch, the better.
Some of the limitations are with the bus, bandwidth, and 'swapping' code in and out of different cores that is inefficient.
Compilers can do some, but from the time new hardware (8 cores) to seeing improvements to compiler, and out to software (applications) and OS, can take a year or more but provide in the neighborhood sometimes of 40%. In which time, newer designs will change the equation. Caching and VM will improve with Leopard, but beyond that...?
So... back to "read world" IF you are in the habit of working with 1-2GB images, then a pair of Raptors for boot is helpful, AND 8GB and more of RAM, AND 4-8 drives for scratch. (Think of those Sonnet Port Multiplier controllers and Fusion 500 style case for 5 drives on one port).
If you work with files smaller than 500MB range, your needs are cut way down.
150GB Raptor boot drive. Small. subtract 25% for minimum free space, 140GB formatted, kind of tight for some. But it handles 60% well.
The outer 30% of 465GB (RE2) is also fast and good performance. I partition large boot drives to keep the OS and apps contained in the outer 1/3.
Mac Pro Memory Usage and Performance
If your work flow means doing more than one thing at a time on your Mac Pro, then you will see significant gains if you spend extra to get the 8-core version. Our Photoshop CS3 actions were completed 39% faster on the 8-core when we had 3 other apps busy crunching. This advantage emerges in spite of the memory bus limitations of the 8-core Mac Pro.
http://www.barefeats.com/octopro3.html
CS3: Justifying 8-Cores
http://www.barefeats.com/octopro4.html
Pshop Test G5 Quad 16GB Raptor RAID
Photoshop and multi-core
http://blogs.adobe.com/scottbyer/
Mac Pro 2GHz 4GB 10K Raptor 23" Cinema Mac OS X (10.4.9) WD RE RAID Aaxeon FW800 PCIe MDD-G4 APC RS1500 Vista

Why yahoo/gmail retrieval and facebook app so so slow when in WIFI. But using the internet to check for emails and facebook is fast using the same WIFI connection??

Why yahoo/gmail retrieval and facebook app so so slow when in WIFI. But using the internet to check for emails and facebook is fast using the same WIFI connection??

Hi SandyS_VZW,
Yes tried resetting the wifi connection and problem still persist.
Here it is...to make it clear. Connected thru the same wifi at home...
-> emails (yahoo/gmail) and facebook WEBSITES are working fine and fast when using/accessing thru a browser (chrome/samsung browser) - no problem with this.
-> emails (yahoo/gmail) and facebook APP is soooooo sloooww (thru the App). Slow I mean comparing it to using their browser/websites... news feeds/emails refreshing so quickly but not when using the APP installed in Samsung Galaxy Note 4. Slow like - It will take around 5-10minutes just to get your emails and news feed refreshed.
THIS HAPPENS ONLY WHEN CONNECTED THRU A WIFI which has a speed of 10-20mb. It is not happening when connected to the network data/plan.
My wife has the same Samsung Galaxy Note 4 (coming from different provider at&t) - same setup (emails, fb app), same wifi connection, but she's not experiencing anything like it.
Not sure why, I dont want to believe that while connected to a WIFI, Verizon is restricting anything and ******* me off to make me switch to my data plan connection everytime - which is Unfair!
Was there a known issue similar about this case?
thanks,

Any ideas on the best Config for RAID-0 on the Precision M6800 using SSD's (and the mSATA slot)

Hi, I have an M6800 on order that has a single 500GB 7200RPM hard drive. I am going to upgrade the storage the day it arrives (removing the 500GB drive and not utilizing it at all). I plan on setting up an SSD RAID-0 array and want to take advantage of the mSATA slot if possible.
I thought of using the 2TB 2.5" Seagate/Samsung Momentus SpinPoint ST2000LM003 hard drive for storing unused vhd\vhdx files as well as video and photos, then using an SSD RAID array for the OS, Applications, Data and any active vhd's.
Is it possible to set up RAID-0 using the mSATA SSD slot and the primary internal hard drive slot?  I want to use those 2 drive connectors so I can still use the 2TB 2.4" regular notebook hard drive without removing the Blu-Ray Writer? I plan to write video to Blu-Ray discs that will be stored on the internal 2TB drive, so removing the optical drive is something I want to avoid.
As a general question, Is there any advantage to using RAID with SSD's, or would a single 1TB mSATA SSD in the mSATA slot be nearly as fast in real world use as a 2 disk SSD RAID? Would I have a noticibly quicker boot time and application load time if using SSD RAID? I know the speed test specs show large increase in performance, but will the computer really run a lot faster with 2 x 500GB SSD in RAID-0 as opposed to getting a single 1TB SSD card for the mSATA slot?
I was planning on getting the Samsung Evo 840 SSD 2.5" drive and the matching Evo 840 mSATA card. There is a Samsung 850 series drive, but it is only available in 2.5" (mSATA is not available in the 850 as far as I can tell).
Please suggest the best solution that is compatible with the M6800 or provide any information that might help.
Thanks

Hi Ential,
Thanks for the info, I thought my question would go unanswered forever. I posted the question in January, and I have since set up the computer. Below I will detail my research and the configurations of drives that I have used on my M6800 since the time I posted the question you answered. Perhaps the results of my research and testing might help you.
I originally I bought the same exact model SSD's that Dell sells with the computer thru their website;    the LiteOn 512GB drives (mSata & SATA), I configured them in RAID-0. The LiteOn drives are sold under the brand name Plextor, I found the proper model numbers by looking at the SSD drive firmware upgrade file from the Dell support website.
From what I understood, my RAID-0 drive consisting of the 2 LiteOn drives had impressive performance using the AS SSD benchmark program, I was getting performance scores over 1600 back in February.
I have since changed to the Samsung EVO 850 1TB drives and again created a RAID-0 drive, one SATA drive and one mSata drive totaling 2TB. This drive array is getting AS SSD performance scores over 1900. I contacted Samsung to get some advice on the configuration of the drives and I got some interesting advice that seemed to help a lot:
Samsung told me to leave 200GB of the drives (100GB each) unallocated when I partitioned the drives, this is generally referred to as "overprovisioning" (which you probably knew already).  I initially thought that overprovisioning could only be configured by the Samsung Magician software and a special process needed to take place to tell the firmware to utilize a specific amount of drive space for overprovisioninng.  The Samsung support agent told me that the Samsung SSD firmware (on both mSata and SSD) automatically uses any unallocated space as overprovisioned space (they are basically the same thing to the drive firmware) and it increases performance in a very noticible way when you have sustained use of the drive and/or durinng the time in between the TRIM process (garbage collection). The unallocated space is used by the firmware to write data to while blocks of data are awaiting internal wiping initiated by the TRIM process.
Since I have 200GB of unallocated space, I am able to have more sustained deletion and writing of data between TRIM/Garbage Collection runnninng than I would ever utilize without affecting the performance of the drive. Basically most SSD drives have performance decrease throughout the day until the TRIM process is completed by the drives firmware, so Samsung instructed me to leave at least 10% of the drive space unallocated to limit that problem. Smaller drives likely need a higher percentage of space unallocated as compared to larger drives since the daily amount of read/write operations is typically the same regardless of drive size.   The amount of space left unallocated/overprovisioned is based upon the amount of read/write operations done on any given drive, not based on the size of the drive itself. If you run drive intensive applications, you would then want to overprovision more GB of drive space, if you have light use of the drive then you can overprovision/unallocate less GB of drive space (all of the configuration info regarding overprovisioning and TRIM was given to me by a Samsung specialist over the telephone - I called their tech support phone number and got a storage specialist to talk to me).
I will look into the SATA version on the optical bay, I never thought about that with this computer. My prior computer was a Dell XPS 17 3D (L702X) notebook which had 2 internal 2.5" SATA, in which I installed an optical bay drive. On that specific computer the optical bay was technically an SATA 3, but due to design constraints it couldnt run at that speed since there was voltage leakage across some pathways in the chipset when the optical bay has read-write throughput that is typical of a hard drive (as opposed to much less data transfer typically seen on an optical drive).  The M6800 can be factory configured with an optical bay hard drive, so I suspect it can support one properly. The XPS 17 was not available with an optical bay drive as an OEM configuration from Dell, so it couldnt be expected to properly support one. The design issue with the voltage leak across the chipset pathways on the XPS 17 was known by Dell, but due to the low bandwidth of an optical drive, the problem never occured with any of the factory OEM configurations.
It is possible that the optical bay hard drive offered by Dell (the exact OEM Drive installed by Dell) could have an internal limitation to SATA 2 due to a similar design limitation. It would not be surprising if an SATA channel designed for optical drives had SATA 2 speed since I suspect there is no SATA Optical drives that could use more than 3GB/s of data anyway.
I purchased 2 of the 2TB 2.5" hard drives that Dell uses for OEM configurations for this computer, they are Samsung 5400 RPM drives. I have one in a 2.5" internal bay and the other in the optical bay - I converted my Blu Ray Recorder/Writer drive to an external drive. I will do some extended time speed tests on the optical bay drive to see if its performance matches the internal drive (which is the same exact model drive - I have 2 of the same Seagate 2TB drives installed with the same firmware).
I use the pair of 2TB drives to store .vhd and .vhdx drives for test platforms for Hyper-V machines. The virtualized servers with high hard drive utilization get moved to the SSD RAID-0 array, the rest are stored on the 4TB rotational drives.
If you have any questions or comments for me, please let me know. I will see what info I can find on the optical bay SATA revision for this notebook, I am very curious to find out if it is in fact SATA 2. I will let you know what my test results are, I will try to use the AS SSD benchmark program, I believe it will work with rotational drives, otherwise I will find another benchmark utility - do you have a recommendation on which to use?
Thanks again for your info and for pointing out the possible limitation of the optical bay..

Does MB use -5V for anything?

I have a K7T266 Pro2 with Palomino-core 1700+.
My old power supply went bad (probably a case of dried electrolytes, only came alive with minimal load) and I bought a Nexus 400W power supply - real nice as it's the quietest power supply I've ever heard.
But, I found that this PSU does not produce the -5V supply at all (the white lead does not even exist in the ATX power plug) ; apparently, it is nowadays an optional item in ATX spec. Probably no problem otherwise, but it causes the bios setup to crash... In the hardware monitor setup page, it prints the voltages properly until the -5V is reached, and (as no voltage is given for MB) hangs there. Apparently, the bios code does not handle out-of-range value properly. Because of the crash, I can't change any values on that page of the BIOS setup...
So, questions:
1) Is -5V needed for anything nowadays - particularly, do the MSI motherboards need that voltage?
2) Has this issue/bug been encountered before by anyone?
3) Who at MSI should receive info of this issue/bug?

Originally posted by jphelzer
A lot of people ask what components the 3.3, 5 and 12 V rails run in a system. To answer your question about what the voltages mean, here's a guide. I found this a while ago, and I don't have the source. Apologizes to the original author:
-12 V: This voltage is used on some types of serial port circuits, whose amplifier circuits require both -12V and +12V. It is not needed on some newer systems, and even on older ones not very much is used, because the serial ports require little power. Most power supplies provide it for compatibility with older hardware, but usually with a current limit of less than 1 A.
-5 V: A now archaic voltage, -5 V was used on some of the earliest PCs for floppy controllers and other circuits used by ISA bus cards. It is usually provided, in small quantity (generally less than 1A), for compatibility with older hardware.
0 V: Zero volts is the ground of the PC's electrical system, also sometimes called common or earth. The ground signals provided by the power supply are used to complete circuits with the other voltages. They provide a plane of reference against which other voltages are measured.
+3.3 V: The newest voltage level provided by modern power supplies, it was introduced with the ATX form factor. Originally, the lowest regular voltage provided by the power supply was +5 V, which was used to provide power to the CPU, memory, and everything else on the motherboard. Starting with the second generation Pentium chips, Intel went to a reduced 3.3 V voltage, in order to reduce power consumption as the chips got faster. This required motherboard manufacturers to put voltage regulators on their boards to change the +5 V to +3.3 V. The regulators produced a great deal of waste heat and having to do this reduction on the motherboard was very inefficient, so now the power supply provides +3.3 V directly. It is used to run most newer CPUs, as well as some types of system memory, AGP video cards, and other circuits.
+5 V: On older systems (Baby AT and earlier) , this is the voltage used to run the motherboard, the CPU and the vast majority of other components in the system. On newer systems, many of the components, especially the CPU, have migrated to the lower +3.3 V described above, but the motherboard and many of its components still use +5 V.
+12 V: This voltage is used primarily to power disk drive motors. It is also used by fans and other types of cooling devices. It is in most cases not used by the motherboard in a modern PC but is passed on to the system bus slots for any cards that might need it.
that lots a bit out of date as most boards power cpu and vga now from plus 12v
but you can see the -5v is legacy and no longer needed
infact the newer psu to the latest specs have done away with it

Is raid good for anything or faster using 2 different harddisks?

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