Difference between Fast Encryption and Full Device Encryption

Researchers bypass Android encryption by exposing phones to freezing temperatures
Don't bother,
Current Android hardware is still vulnerable to cold boot ram forensics,
The encryption will be pointless until Android's RAM inherits the properties of DDR3(which is not nearly as vulnerable to cold boot, DDR3 has a few second window to be frozen)

I would never store my private data on anything less than Serpent-Twofish-AES with Whirlpool Hash, a keyfile, and a password no less than 30 characters long.
Without all that you might as well not encrypt at all, like the old saying goes "do it right or not at all"

EDIT: Unless you have your phone off when it gets stolen, If the thief wants your data they can use cold boot forensics. More than likely though they will just format your memory, resell the phone and use the sd card for something else.

To Your question though, With Flash memory you might as well do full drive encryption.
The Read/Write speed on Flash Memory is too fast to worry about.

Also, If you have deleted non-encrypted private data recently the Fast Encryption will leave that data vulnerable to recovery.

 

My Folio 13 has a SSD and It has full drive encryption.
It encrypted fast and it reads/writes very fast.
The Burden on the cpu may cause decreased battery life for your client
depending on how much he/she reads/writes.

 

Full disk encryption is more secure.

However from what I understand Fast encryption will encrypt evreything you write, however it will not prevent recovery of any files that were deleted before the encryption.

 

The way they use the term "memory space" makes me wonder if they are refering to only encrypting the RAM at runtime, not the NAND flash storage space on the phone.

 

Found this thread and decided to reply.

This attack only worked because the researcher could unlock the bootloader and install a custom firmware. This also won't work anymore because newer phones will secure erase and do this before it unlocks the bootloader. Also, as of version 6.0, using TEE to store a unique key is required.

Unlocking the bootloader is not an option on most phones, and even if you can, are by default set to not allow an "OEM unlock" by default unless enabled in the dev options.