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When ripping DVDs while encoding something else and playing a game in the background, it just plain rocks. I’m quite certain that the overall drive performance is what has been propping up the rest of my system, mouse drivers download and letting me put off any upgrades. There is little point in letting each drive in an array process a little piece of the same I/O request , since it will not improve performance.

The rotational latency of a single disk in the array is the same as for that disk outside of the array. The seek time of an array is the same as for a single disk. Its not wise, as it removes your redundancy, but in the case of a home user, it may be an entirely valid backup method if the second drive is only synced up periodically. RAID 1 can certainly degrade (i.e. go from 2 to 1 disk) and be rebuilt . This brings me to my next question – Can a RAID 1 array be built anytime without having to start from scratch (e.g. reinstall the OS, etc.)?

P.S. I used to do the Strip thing but like many things that I regret from my past I have learned the hardway that it is not worth it. RAID-0 will always slow your write times by a measure. You can get a much faster system with better components for under $3000 @ this thread. It also explains in technical detail what the real issues of CPU, Memory, & I/O are in regards to the software you use. The 32MB cache disks will be slightly faster than the 16MB cache disks.

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True, you will always have the slowdown you describe for a two block read that spans two disks, but the average case should have little slowdown for any IO size. Each time you add a drive, it will "eat up" half of the time between where you currently are, and the time of a full rotation. The reason for the increase in rotational latency has to do with the randomness of the individual disks, combined with how we define rotational latency. We say the rotational latency of a single disk is equal to 1/2 the time of a single rotation of the disk. Because that’s the AVERAGE of the possible rotational latencies.

• All versions of Windows include a utility for defragmenting the hard drive.
• You can get to the defragment utility from the Computer Management window.
• Remember, you’ll need at least 4 GB of free space for Ubuntu, plus you’ll probably want to keep some extra free space for the original operating system.
• To find out how much free space is available on your Windows partition, you can turn again to the Windows Computer Management tool.

One other question – Can a RAID 1 array be built at any time? That is, can the second disk be added without requiring a reinstall of everything? If your looking for a faster drive now a days I understand that SSD is the way to go. It was my understanding that RAID0 has faster reads and writes than a single drive, though not significantly for most applications.

Can I just add a second drive and build the array? For example the single drive perfromance of a 500GB Hitachi HDS725050KLAT80 can reasonably be compared with the performance of 4x Hitachi 400GB HDS724040KLAT80 in RAID 0 configuration with Intel IOmeter. I even left one of the 160 gig hitachi’s in the machine to act as my target for fraps material. so that it doesnt tie up any of my other harddrives.

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The Sandra disk speed benchmark is NOT a meaningful benchmark, unless you’re doing continuous reading/writing from/to a disk to/from a single stream. The HDTach read/write benchmarks are in the same class .