On 06/08/2015 18:18, meino.cra...@gmx.de wrote: > Hi, > > for my tablet PC I used a used 32GB FAT32 formatted SDcard. The > formatting was already done by the manufacturer. > Then I screwed it up and had to do the partioning and formatting > myself again. "No big deal", I thought -- and was wrong. > Yes, the "thing" I got could be read and written. But it was > DAMN slow in comparison to the original formatting. > > I googled and found a description, which described exactly, > what I wanted: An optimal formatting for one big FAT32 partion. > I did it again ;) and: TADA! The speed was back. > LINK:http://zero1-st.blogspot.de/2012/05/formatting-fat32-volumes-larger-than.html > > Now I need the something identical but explained in a way > that it can be successfully applied to any partion layout > and any SDcard size. > Currently the new SDcard has 64GB (yes, the tablet eats that size > well :) and needs at least two partions: One FAT32 and one ext4. > May be that I need a different layout later. > > To what aspect and "logic" do I have to keep my eyes on, when > it comes partioning/formatting any SDcard size with any partion > layout and any filesystem?
As I understand it, the most critical thing is to keep the FS block size aligned with the native block alignment of the device. Example: Using 4k blocks that start at 1k is obviously going to be a problem - writing one block of data to the FS will always involve writing two blocks to the physical device -- Alan McKinnon alan.mckin...@gmail.com
