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what happened to /dev/xvdd in my instance?

Hi, All:

I am working on a script to handle data disks. So, I added a few data disks to my instance. Then I noticed that in listVolumes api output, the third data disk actually has a deviceid 4, instead of 3 as I would expect.  Sure enough, in the guest OS,  I see three data disks as /dev/xvdb, /dev/xvdc, and /dev/xvde.  There is no device /dev/xvdd.

Why does CloudStack skip device /dev/xvdd?  I have verified this behavior on both ACS versions and