Do i need to defrag my 2011 Macbook Air ssd?

SSD's don't need defragmentation. Actually, it could decrease the life time of your SSD.

JronMasteR said:

SSD's don't need defragmentation. Actually, it could decrease the life time of your SSD.

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I think you'd have to defrag your SSD constantly for years before causing any noticeable decrease in lifespan.

NO, never defrag your SSD. It won't do you any good.
All modern SSDs are equipped with garbage collection and technology like TRIM to make sure they're all in good condition.

Read this if you still in doubt
http://en.wikipedia.org/wiki/Garbage_collection_(SSD)#Garbage_collection

uicandrew said:

i've installed and uninstalled a 30gb bootcamp partition 3-4 times on my stock 128gb ssd on my macbook air.

normally, on my old macbook or imac (with a regular hard drive), i would defrag my hard drive if i used it to move or work with very large files.

but with TRIM, i don't know if it is necessary or not

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The magnetic head of a traditional HDD requires an average of 8ms to move to a random part of the disk (only down from 30ms in the late 90s) - this is one of the major bottlenecks in real-life data throughput.

Defragmenting ensures that files are on continuous sectors, minimising the head movement to once per file (ideally).

SSDs do not have a physical read/write head, therefore de-fragmenting would not provide a noticeable increase in speed AFAIK.

TRIM support addresses a different issue, but could roughly be considered the SSD analog to HDD defragmenting.

As far as I'm aware, files on SSDs are spread across the chips on purpose in order to increase read/write speed.

mopatops said:

As far as I'm aware, files on SSDs are spread across the chips on purpose in order to increase read/write speed.

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The data is spread out as a form of wear leveling. That way the individual memory cells get written to evenly. Effectively, increasing the life of the individual cells and the drive.