I'm evaluating full drive encryption using Truecrypt on my Crucial M4 SSD on Windows 7 32bit Pro on my Toshiba NB100 Atom N270 Netbook.
I've encrypted this and noticed an increase in the boot time but once booted the performance doesn't seem to be affected and Windows Experience Index is unchanged (compared with unencrypted). Related question: How to encrypt dual boot windows 7 and xp (bitlocker, truecrypt combo?) on sdd (recommended?)
However, I wondered if encryption was really necessary for me as I value the extra performance that might be lost if I encrypt.
The netbook is personal and sometimes occasionally used for work for remote on-call working or emergencies. I don't really have anything any more sensitive than the next person: career documents, household docs, contacts, ideas/original material -- though these are personal enough not to want to let them fall into the wrong hands if the netbook got lost or was stolen.
So I just thought if there might be alternative regimes/measures that could be used to protect such data. I could encrypt a partition for example and not the system drive, but traces are left on the system drive e.g. temp files, swap file etc.