240GB Sandisk Extreme problem erasing data

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Hello, I am new to ssd’s and I am having a problem with my new ssd 240 BG extreme for my early (4,1 model) 2008 macbookpro.  The problem is that I first cloned my old HD to the ssd, and almost filled it out.  I only had 15 GB of free space, then I erased some files that were about 50GB.  On the finder it says that I have 65GB of free space, but if I open disk utility, it says that I only have 15Gb of free space.  When I tried to install bootcamp, the bootcamp utility also only reported 15 GB of free space, I researched a little bit and found out about the trim enabler, I installed it and ran it enabliling the trim.  I re-cloned my old hd to my ssd and the problem persists, I still can’t claim the space from the erased files.  My firmware for the ssd is R201, I tried to flash the ssd with the new firmware but was not able to, it does not boot into the firmware upgrader, I tried with a cd and with a pen drive and nothing.

Any ideas on how to reclaim the free space??

Thanks

Jonathan Zighelboim

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did you empty the trash once the files were deleted? if not MAC does not free the space. 

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Hello drlucky, yes, I did empty the trash.  

From what I have seen in the last week, the ssd is deleting the data, but only if it is small amounts, for example, if I erase a 10 mb file it does the job correctly, but if the file is big, 2 gb, then it does not erase it porperly, as I stated in my original post.