On Thursday 06 Aug 2015 21:17:29 Alan McKinnon wrote: > 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
I was wondering similar questions regarding a 32G flash card I have. Using fdisk to partition it the starting sector was automatically aligned with 2048 as it fdisk has been improved to deal with 4KB sector drives. However, formatting it with mkfs.vfat I was none the wise if I should use the '-s sectors-per-cluster' option or what to set it at. Furthermore, how can I read the current cluster size off the flash card? Is this appropriate? blockdev --getbsz /dev/sdb 4096 -- Regards, Mick
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