The factory default file system is determined by the product category, series, and storage capacity, as shown in the table below：
| Product Category | Applicable Series / Specifications | Default File System | Notes |
| USB Flash Drives | JetFlash (JF) standard series | FAT32 | All capacity |
JF9XX series (high-performance) | exFAT | exFAT offers better compatibility for high-speed data transfer applications |
| Memory Cards | 32GB or smaller | FAT32 | Applies to both consumer and embedded series |
Larger than 32GB | exFAT | Applies to both consumer and embedded series |
| Portable SSDs | ESD series (all models) | exFAT | |
| External Hard Drives | StoreJet (models with Type-C interface) | exFAT | Examples : 25C3S、25M3C |
| StoreJet (other models) | NTFS | |
| Internal SSDs | SSD series (all models) | Unallocated / RAW | |
** Important note ** : If a USB flash drive with a capacity larger than 32GB is manually reformatted from FAT32 to exFAT,it cannot be reformatted back to FAT32 using the built-in Windows formatting tool. Third-party formatting software is required.