Well, IDE (PATA) has an interface with 16 parallel bits (see https://www.pjrc.com/tech/8051/ide/wesley.html#idecon), while SATA has a serial interface. But that doesn't say anything about the structure of the head (could be serial or parallel) or the way the bits on the flash-sticks are written. Consider that internal and device dependent, then you're probably right.
It's only important for the electronic engineers that design the lowest level of chips.
Whenever I make an action, save, change etc. a file:
How many bits is written by the writing-head to my HDD at a time?
Does it write several bits simultaneously, or only one bit at a time, until the whole action is written?
I have the same questions for SSD and the flash-memory function?
I have only been able to find something about writing speed
Thanks a lot in advance for answering