Tried installing but failed on second file...

I downloaded files to a linux desktop and transferred to my memory card. On my desktop the file sizes were correct, but on my memory card the size of the biggest one lost about 20 megabytes... It did this after I transferred the files a couple times, still "lost" the same amount of data everytime...

Now when I enter my memory card the n800 displays a message that says it's corrupt. I tried reformatting it with file manager but that didn't work.

How do I get my SDHC 4GB memory card back in working order so I can flash my tablet and try the process over again?

PS. The files were all supposed to go on the same memory card, Correct?