Two factors as to why a drive gets slower at searching or recalling data or information on the drive are.
How full the drive is in content and how much free space is left of it.
A drive that almost all of it`s capacity filled with data and a small amount of free space tends to perform much slower.
It is believe it or not recommended that you leave at least of any drive with 10% of free storage space on it.
To keep the drive running at optimum speed, and read and write access times, faster.
Older drives like the 80Gb capacity one you have in the raid 0 array, suffer more due to the age of the drive and the capacity.
When you set a Raid 0 array up it is always best to match two drives of equal size in storage, and the date or year that they were made.
Making sure each drive uses the same spin speed rotation and read and write access times.
And of the same brand name and model number to get the best possible performance.
Stupid as it sounds, it is in fact true.
Because older drives for example take, or should I say took longer for the read and write heads of the drive to access information or write it.
For best performance it is always best to use a matched pair of HDD`s in all of the respects stated for optimum performance of the raid 0 array you create.
It`s like having a drag race between a Ferrari and a old skoda car.
But the Ferrari is tied to the skoda car and dragging it along.
The Ferrari will still get to the winning post first.
Only slower due to pulling the skoda along also.
And waiting for the skoda to cross the Finnish line before the results of the race can be announced.
Sorry for the metaphor.
Roughly speaking the faster HD has to wait for the slower one to complete the task set, before all of the data or contents of the drive is shown.
And there is the problem.
If you weighed a car down also just like filling a drive with lots of data to almost it`s full capacity, it will also take longer to complete the task set for it to do.
The faster drive will be slowed down by the slower drive.
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