HCC has five FAT file systems, each designed to achieve the best balance of performance and resource utilization in their targeted embedded configuration. Three of these file systems share a common API to ensure portability, and all can interface with any type of sector-based media.

Use this table to work out which product to use for your application. Click the header links for full details of each system.

  FAT   THIN   SafeFAT   exFAT   SafeexFAT  
Code Size1 ~24kB 4-12.5kB ~31KB 35 KB 47 KB
RAM >3KB 0.7->2KB >6KB >16 KB >18 KB
Fail Safety N N Y N Y
Long Filename Support Y Y Y Y2 Y2
Unicode Y N Y Y Y
Multiple Open Files Y Y Y Y Y
Multiple Open File Users Y N Y Y Y
Multiple Volumes Y N Y Y Y
Multi-sector R/W Y N Y Y Y
Partition Handling Y N Y Y Y
Media Error Handling Y N Y Y Y
Test Suite Y Y Y Y Y
Relative Performance very high medium/low high very high very high
Cache Option Y N Y Y Y
Zero Copy Y Y Y Y Y
Re-entrant Y N Y Y Y
CAPI Support Y N Y N N
Secure Delete Option Y3 N Y3 N N
FAT-compatible Y Y Y N N
  1. Approximate numbers based on Cortex-M3 at high optimization with long file names active. These can be reduced further by not using long file names.
  2. exFAT and SafeexFAT only have long filenames – there is no short filename concept.
  3. Needs special driver support.