About sd_flash_write function - 0xFF evaluation & delay time

Hi guys,

I have some questions about sd_flash_write function:

  1. Will sd_flash_write() evaluates if the input value is 0xFF so that it won't need to perform an unnecessary write?

  2. If there is no 0xFF evaluation, would it be faster to write 0xFF than to write other value?

  3. How long would it take to write 256 words at a time using sd_flash_write() function? Would it cause any great side effect? How about the erase time (1 page of 256 words)?

I'm using SD s110 v7.0.0 on nrf51822 chip.

Thank you for any help!