RAID 0 volume failed - Intel RST, W530 (wonder if it is hardware issue now)

Hi,
My laptop is about two years old. I got one of two intel RAID 0 volumes failed several months after I got this laptop. This problem has been on my laptop for a long time.
The functionality of my laptop started to become poor after this volume failed.In the beginning, windows explorer stopped working and restarted every time I opened the laptop. The windows repair tool said windows could not be repaired... So I reinstalled the OS and reset it to factory setting. However, the crashes persisted and gradually became more frequent. Many other error reports showed up. After searching for solutions, I finally did a clean windows install and used the BIOS Intel RST to repair the corrupted volume (I deleted old volumes created new ones).
Unfortunately, now, the same volume fail error appears again and the functionality of my laptop is impacted. Sometime I cannot save my excel or pdf file because program stop working, or cannot open a pdf file. I have to restart the OS.
The detail error message of Intel RST is: "your volume appears inaccessible. Try fixing any problems reported on the array disks. If this fails, review the Troubleshooting section under Help for more information. In all cases, back up any accessible data before taking action".
I'm now wondering if it is the hardware issue. If so, I'm thinking about buying an extended warranty because my orignal warranty has expired. However, I'm not sure if the warranty can cover this... 
In this community, I find there are two types of extended warranty, one will start from the expiring date of the original one and the other will start from the date of purchase. I suppose I need to find the second one.
I'm also wondering the quality of the warranty. Will it take a long time to repair if I send it? or will it take a long time for them to ship?
Any idea, solution and experience in warranty / repairment would be appreciated.
Best Regards,
Haoyi
BTW, here is also my experience with Lenovo if you would like to have a look at:
I got my W530 two months after purchases... I found it was a common problem in Lenovo... 
When my laptop was still in the original warranty, I contacted the lenovo customer service for repairment of the failed volume. Those people told me it was errors coming from my software. They said the repairment was not covered in the original warranty and I needed to buy a new type of warranty (related to software repairment). I had no confidence in the quality of lenovo's customer serivce... So I did not buy it.

Hi, Colonel,
Thank you for reply. I tried HD Tune, but it cannot show any information about my harddisk. It only shows Intel Raid 0 Volume, the firemware version is 1.0 and the capacity is 931.5GB. There is no other information, such as serial number, standard, supported, and buffer. I cannot choose supported features. HD Tune also cannot display the temperature of my drives. What should I do?

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    =======
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    =======
    Mar 7 17:56:42 files kernel[0]: disk4s3: I/O error.
    Mar 7 17:56:42 files kernel[0]: disk4s3: I/O error.
    Mar 7 17:56:42 files kernel[0]: disk4s3: I/O error.
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    =======
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    Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
    Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
    Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
    Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
    Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
    Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
    Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
    Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
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