What is the best allocation block size for HDDs in Hyper-v?

Hello experts,
A server will be running Hyper-V soon. All virtual machines and their virtual HDDs will be stored on D driver of the physical machine.
What is the best allocation unit size for formatting the physical D drive? Shall it be the biggest available option (64k) for getting better performance?

Hi,
You can check the following post.
Recommendations for base disk cluster size for hosting Hyper-V Virtual Machines?
http://social.technet.microsoft.com/Forums/en/winserverhyperv/thread/45919c42-bc39-47f4-9214-3f1cf00f2ea9
Best Regards,
Vincent Hu

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