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I am trying to implement USB mass storage device. Its memory capacity is 16kB. I have referred Keil USBMem example for MCB2140. I referred some file system tutorials. Can FAT16 and FAT32 be used for such a shorter memory? I think I will have to go for FAT. Is FAT still used?
You can see it is a FAT12 is you examine the boot record provided with the samples (see google for details). I recommend you leave this idea behind you, as it will not fit your needs: the host cannot simply synchronize with the device without generally re-enumerating the device. As Andy suggested, you are much better of with a virtual COM port (easy for the host) or an HID connection, which required more host-side work.
I want to store the readings and access them later. How can I do it? And i wish to work on USB only. I don't want to go for virtual COM port.
"I don't want to go for virtual COM port"
The "virtual COM port" is just how it appears to other applications on the PC - the actual communication with the device is "USB only"