The CSS SQL Server engineering team points out that the LDF stamp has changed from 0x00 to 0xC0:
Question: If the log is stamped with 0xC0’s instead of 0x00’s how is it a performance gain?
Many of the new hardware implementations detect patterns of 0x00’s. The space is acquired and zero’s written to stable media, then a background, hardware based garbage collector reclaims the blocks.
This is a very interesting background article which shows an integration pain point between the database platform and the storage platform.