Install from Recovery partition after upgrade from 10.9

Hi all, on my MacBook 13" nov. 2012 I upgraded from Mavericks to Yosemite using the standard upgrade.
After a couple of days I decided to perform a clean install:
- formatted "Macintosh HD Partition"
- rebooted with cmd+R
- reinstalled from recovery partition.
Is this really a clean install or my recovery partition contains pieces of the old Mavericks?
Thanks in advance for answering
Paolo

paolo_italy wrote:
First I upgraded from Mavericks to Yosemite (with no erase). Then I booted from recovery partition, erased Macintosh HD partition and installed Yosemite.
My question is: did I perform a really clean install or to be sure I had to erase the entire disk and recover from the Internet?
Paolo
You performed a clean install of OS X Yosemite.
You were in the Yosemite Recovery HD.
You erased the Macintosh HD which erases the previous OS install, user accounts and data files -- everything! Then you reinstalled JUST OS X Yosemite.

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