Creating a Striped Raid from two used disks

I have *2 internal 300GB drives* in my G5. My start up disk has *4GB left* and my second drive has *80GB remaining*.
I want to make a *striped Raid* of the two disks to allow me to use the remaining 84GB as startup space.
I am guessing that if I backup the second drive and erase it I can add it to my startup disk without loosing its information and create the RAID. Is this the case?
Can anyone give me any pointers for the process and are there any draw backs to having a striped raid as a start up disk.
Thanks in advance for any help you can give me with this!

Are you using bootcamp for Windows?
Unless something has changed, if your startup disk is a raid (of any flavor), Windows will not see it.
You'll have to use the option key at startup to switch back to X.
If you are using sheepshaver or similar for OS9, 9 will not see the raid.
Both are minor, but can be annoying.
I believe you need 3 disks for a striped raid.
2 for the actual raid, and the 3rd for parity.
This setup allows for data recovery in case of failure.
a 2 disk raid striped is subject to data loss if one of the drives fails.
If I recsll correctly, both drives will be formatted during the raid creation process.

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Can anyone help?
I'm new to Final Cut Pro and trying to set up a Striped RAID Set with three internal 500 gb drives...
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Regards, Hans Vogelaar (http://www.eileenslounge.com)

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i am probably not following instructions very well and i am not finding an explanation in the documentation so i am hoping someone can help me out here.
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Hotwheels 222,
It might help to think of PDF as a container that can have many things such as text, photos, graphics, vector elements,etc all wrapped up inside it.
Normally the content is created in another application such as InDesign, Illustrator, MS Word, or many other appliations. In the application you create a blank document and add or place images, type text in any font you desire, place or create some vector elements (if the application actually have any vector tools), and even other multimedia like audio/video as long as the application supports them,
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A PDF created from an application like Photoshop will just have one resolution because PS is a pixel based image editor and a PS document can only have a single resolution.
. . .the idea that two adobe products cannot communicate from acrobat to photoshop in terms of a pdf resolution in photoshop seems very inconvenient. . . Again, since a PDF may have many photos with different resolutions, even if PS could get this info (which it can't) what resolution should PS decide to use? PS leaves this up to the user to decide based on what they want their final output may be.
You mention a document you have that "appears to be no images inserted" and "it appears as if it is one image"?
Are you referring to the Cover pdf? The PDF producer is "Adobe Acrobat 10.0 Image Conversion Plug-In" is a tip off to "Test Screen Name" and myself that it came from Photoshop.
While its possible this document was completly created in Photoshop, it is also likely that it was created in another application like InDesign, etc. exported from there as a PDF and then the PDF was opened in Photoshop which rasterized the content and flattened it into a image file with the resolution that you chose when opening in PS and then saved again as just an image in the PDF format. The graphic artist that created this probably did this because they didn't want to give you a print quality PDF that you might try to extract elements from.
You mentioned you thought the doc was from Adobe Illustrator (AI) AI is primarily a vector creation tool which also allow for the inclusion pixel based raster images (with a specific pixel resolution) to be placed in an AI document if wanted. Strictly speaking, vector objects don't have a resolution. They are based on math,
It basically says, place a point at such & such X, Y coordinates, now place another poing at some other X,Y coordinates, it takes into account the arc or angle between the two points and says draw a straight line, or draw a curved line ,etc. Since these are only mathematical instructions. this can be enlarged as big as you want and the relationship between the 2 points and the arc of the curve or line will dictate how the enlarged line or curve will be redrawn.
Vectors are "resolution independent" you can draw a vector logo at 1 x1 inch, and enlarge it to 50 x 50 inches or even as large as a house and it will still print crisp and clean. Note, this only applies to the vector content in your document; any pixel content is stuck at the resolution it was created at.
To inspect elements in a PDF use the Object Inspector in Acrobat Pro. Since a PDF may contain many differing objects you need to click exactly on each object to get any info about the selected object. So if you had 10 photos in your PDF you would need to select each in turn and it would give you the pixel dimension, resolution, color space and profile, etc. if you clicked on text it will identify the font. It is well named, an Object Inspector rather than a Document inspector. Try it yourself with different PDFs you may encounter. If for example, it gives you the exact same info (resolution, pixel dimensions. etc) no matter when you click, then you are likely dealing with a whole single image. If you get different pixel dimension, resolutions when you click in various different areas you are dealing with a PDF that had separate distinct elements.
. . . i can't see why i shouldn't be able to get a document that is 17.7 x 22.9 at 72 ppi down to one that is 8 x 11 at 300 ppi.
In Photoshop, go to the Image menu, Image Size. This will show the pixel dimensions (width & height) at the top. If you don't interpolate (Resample) Photoshop can only put the same number of pixels into different size documents. When you squeeze the same # of pixels into a smaller doc the resolution goes up. When you place the same # of pixels in a larger doc the resolution goes down.
Remember, that resolution is PPI (Pixels Per Inch)! If you do the math this will start to make sense.
Below note that each dialog box has the EXACT same pixel dimensions.
In the first box it shows the 1275 x 1650 pixels in a document of 17.708 x 22.917 inches. This yields a resolution of 72 PPI.
In the second box I changed the document size to 8.5 x 11 inches and the same 1275 x 1650 pixels now increase the resolution to 150 PPI.
In the third box I changed the resolution to 300 PPI and the same 1275 x 1650 pixels now decrease the document size to 4.25 x 5.5 inches.
If you click the Resample Image box, Photoshop will interpolate (resample) the image by throwing away pixels or by adding pixels, but there is no magic involved, and the results are never as good as one might hope for.
Like Goldilocks and the 3 Bears, some things are best when they are "just right"

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/people/ravikumar.allampallam/blog/2005/03/03/creating-purchase-order-idoc-through-xi
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First off a mirrored RAID requires two drives of equal size (could be two striped RAIDs of equal size.) So, as I understand what you have to work with you can create a single 500 GB mirrored RAID using two of the 500 GB drives.
You could create a striped RAID array using two of the 500 GB drives, then combine it with the 1 TB drive you have to create a 1 TB mirrored RAID. But this would not be the best alternative because if one of the smaller drives in the striped array fails then you lose everything on those drives. Not so bad as long as the single 1 TB drive is OK.
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RAID Basics
For basic definitions and discussion of what a RAID is and the different types of RAIDs see RAIDs. Additional discussions plus advantages and disadvantages of RAIDs and different RAID arrays see:
RAID Tutorial;
RAID Array and Server:
Hardware and Service Comparison.
Hardware or Software RAID?
RAID Hardware Vs RAID Software - What is your best option?
RAID is a method of combining multiple disk drives into a single entity in order to improve the overall performance and reliability of your system. The different options for combining the disks are referred to as RAID levels. There are several different levels of RAID available depending on the needs of your system. One of the options available to you is whether you should use a Hardware RAID solution or a Software RAID solution.
RAID Hardware is always a disk controller to which you can cable up the disk drives. RAID Software is a set of kernel modules coupled together with management utilities that implement RAID in Software and require no additional hardware.
Pros and cons
Software RAID is more flexible than Hardware RAID. Software RAID is also considerably less expensive. On the other hand, a Software RAID system requires more CPU cycles and power to run well than a comparable Hardware RAID System. Also, because Software RAID operates on a partition by partition basis where a number of individual disk partitions are grouped together as opposed to Hardware RAID systems which generally group together entire disk drives, Software RAID tends be slightly more complicated to run. This is because it has more available configurations and options. An added benefit to the slightly more expensive Hardware RAID solution is that many Hardware RAID systems incorporate features that are specialized for optimizing the performance of your system.
For more detailed information on the differences between Software RAID and Hardware RAID you may want to read: Hardware RAID vs. Software RAID: Which Implementation is Best for my Application?
Do You Really Need a RAID?
There is only one thing a RAID provides - more space. Beyond that a RAID can’t help you with:
Accidental deletion or user error
Viruses or malware
Theft or catastrophic damage
Data corruption due to other failed hardware or power loss
Striped RAIDs have a higher failure risk than a single drive
The purpose of a RAID is to provide high speed mass storage for specialized needs like video editing, working with extremely large files, and storing huge amounts of data.
If your array fails it means complete loss of data and hours of time to rebuild. RAIDs degrade over time necessitating many hours of restoration. And, if you don't know much about RAIDs then you really don't need one.
You can use a RAID for backup. But unless your backup needs involve TBs of data requiring rapid and frequent access, why bother? TM works in the background. It's not like you have to sit there waiting for your backup to be completed. Furthermore, you're buying two drives possibly to solve a problem where a single drive will do. And, one drive is less expensive than two.
Ignoring overhead, two drives in a RAID 0 (striped) array should perform about twice as fast. However, as the array fills up with files that performance will degrade.
RAID was a technology that in it's time was meant to solve a problem. Large capacity, fast drives were extremely expensive. Small drives were cheaper but slower. However, combining these cheaper drives into arrays gave faster performance and the larger capacity needed for data storage needs. Thus, the reason why it's called Redundant Array of Inexpensive Drives. But today you can buy a 3 TB drive with performance that's better than the 1 TB drives of two or three years ago.

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=============================
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This is so sad. I read your comments and I said, "Huh?" Haha!
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RAID 0+1 using ExpressCard/34 with double eSata

I have a problem, and maybe someone here can help me a bit. Many thanks in advance.
I am doing a lot of RAW photo editing and also sometimes video processing. I want my pictures and video to be stored on an external hard drive connected to my MAC BOOK PRO using ExpressCard/34 and at the same time I want to have continuous backup of my files. I am thinking of playing a bit with RAID 0+1. Here is my plan:
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Hi Danny,
Yes, I did read it, but it did not address my particular situation - i.e. all four drives connected to the promise controller. The bits that do seemed to be saying "look at the manual", which isn't helping me. Last night, I updated the mainboard bios to 2.4, which didn't make any difference, so I'm still stuck.
Thanks for taking the time to reply
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