If I recall, the desktop version was like a full image flash which is why it was bigger. It was also why rootkeeper didn't work because it would destroy the copy made by the program to protect root. The ota didn't touch the place where the copy was stored and thus was safe.
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Current Devices: Nexus 5, HP 14 Chromebook (Data Enabled), Google Glass, (2013) LTE Nexus 7, Chromecast
Retired: Samsung Fascinate, Droid Charge, Galaxy Nexus, (2012) WiFi Nexus 7, Asus TF700, Nexus 4, Logitech Revue