Is it possible to wear-level a FAT32 file system?
The OS references blocks using a &quot;logical block address&quot;.  The SD card then maps this to a physical page of flash memory.  With wear leveling, each time data in that block is changed, it will get mapped to a new physical page of flash memory.  So, even though the OS is changing the same &quot;logical block address&quot; every time, this is causing different physical pages in flash to be erased and rewritten.  This spreads out the &quot;wear&quot; across the entire flash device, lengthening its lifetime and avoiding the problem you mentioned.  In other words, although the FAT32 is stored at the same &quot;logical block address&quot;, it isn't stored on the same physical page of flash memory every time it is modified.
I'd expect that any commercial flash storage device you buy today will be using wear leveling, because of exactly the problem you mention if wear leveling isn't used.  This problem is not specific to FAT32; it occurs with essentially all conventional filesystems.