MacBook boots up twice after installing Mac os x 10.5.3-is this a problem ?

After installing os x 10.5.3, my MacBook booted up twice, as well, thinking that something might be wrong with the hard disk, it showed that I had only 87 gb of ram, down from 90 gb two day's ago. Can anyone help?

F.N.H.,
The additional restart is normal. This is a necessary part of the updates installer script. Most updates do not require the double-restart, but a few of the major one's do.
You do not have either 87 GBs or 90 GBs of "RAM." You may have that much hard disk space, but RAM is directly accessed memory that is used to temporarily store instructions for running applications and "live" data for same. You probably have 2 GBs of this. At any rate, it is probably normal to have lost 2 or 3 GBs of hard disk space over the last day or so, especially having run the update.
Scott

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