Sometimes fstrim takes 30 seconds to complete, I think it must be doing some writing in that time
But you are right, that is not long enough to zero all of the drive, is it writing its internal data structures?
I am not aware of any uSD that can be 'trimmed' , typical response is "command unsupported"
The "SD Card formater" from the SD foundation, running in win can do this, is there a linux tool?
--edit--
And I'm wrong, time has moved on, badly needed and I am glad to be wrong here
In both cases, uSD and eMMC fstrim takes up to a minute, green led blinks, think it is writing
But you are right, that is not long enough to zero all of the drive, is it writing its internal data structures?
I am not aware of any uSD that can be 'trimmed' , typical response is "command unsupported"
The "SD Card formater" from the SD foundation, running in win can do this, is there a linux tool?
--edit--
And I'm wrong, time has moved on, badly needed and I am glad to be wrong here
In both cases, uSD and eMMC fstrim takes up to a minute, green led blinks, think it is writing