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I have Windows 7 Ultimate 64 bit installed on a Western Digital 500GB drive (WD5000BEVT-22ZAT0) that was partitioned automatically by Windows as 100MB System Reserved and 465.66GB drive C.

There is also an unallocated second Western Digital 500GB drive (WD5000BPVT-22HXZT1) that I want to use for RAID 1 to mirror the first drive but I get an error message stating

“ALL DISKS HOLDING EXTENTS FOR A GIVEN VOLUME MUST HAVE THE SAME SECTOR SIZE, AND THE SECTOR SIZE MUST BE VALID.”

I uninstalled Windows patch KB-982018 but I still get the same error message. Could you please let me know how to resolve this?

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It looks like you are having trouble with Advanced Format.

The WD5000BPT uses advanced format, while your current drive, WD5000BEVT, does not. Advanced format simply means that the sector size of these newer drives are now 4k bits instead of 512 bits. This allows drive manufacturers to build larger, cheaper drives. More info.

Western Digital has an alignment tool that can be found here. It may help your issue.

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Cameron did give you excellent info on the topic. Using the alignment tool should enable you to freely use both drives. A couple of notes from me: - Having two different drives in a RAID array potentially increases the chances that a drive would drop out of the array due to differences in the firmware, speed, etc. I'd try to have as similar drives as possible for the most stable RAID array and better data safety. - WD Blue isn't really recommended for RAID usage as it does not have the required features such as TLER for safer and more stable performance in RAID environments. I'd try to stick to NAS/RAID class drives for better safety and stability (WD Red is a good example).

Post back if you need more info!

Captain_WD.

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Your link contains redirection, which blocks it in my browser. – fixer1234 Jul 4 at 7:27
    
Apologies. This is the actual link: wdc.com/en/products/products.aspx?id=810 – Captain_WD Jul 4 at 7:34

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