FAT32:
- Maximum number of files: 268,173,300
- Maximum number of files per directory: 216 - 1 (65,535)
- Maximum file size: 2 GiB - 1 without LFS, 4 GiB - 1 with
NTFS:
- Maximum number of files: 232 - 1 (4,294,967,295)
- Maximum file size
- Implementation: 244 - 26 bytes (16 TiB - 64 KiB)
- Theoretical: 264 - 26 bytes (16 EiB - 64 KiB)
- Maximum volume size
- Implementation: 232 - 1 clusters (256 TiB - 64 KiB)
- Theoretical: 264 - 1 clusters
ext2:
- Maximum number of files: 1018
- Maximum number of files per directory: ~1.3 × 1020 (performance issues past 10,000)
- Maximum file size
- 16 GiB (block size of 1 KiB)
- 256 GiB (block size of 2 KiB)
- 2 TiB (block size of 4 KiB)
- 2 TiB (block size of 8 KiB)
- Maximum volume size
- 4 TiB (block size of 1 KiB)
- 8 TiB (block size of 2 KiB)
- 16 TiB (block size of 4 KiB)
- 32 TiB (block size of 8 KiB)
ext3:
- Maximum number of files: min(volumeSize / 213, numberOfBlocks)
- Maximum file size: same as ext2
- Maximum volume size: same as ext2
ext4:
- Maximum number of files: 232 - 1 (4,294,967,295)
- Maximum number of files per directory: unlimited
- Maximum file size: 244 - 1 bytes (16 TiB - 1)
- Maximum volume size: 248 - 1 bytes (256 TiB - 1)
Reference: http://stackoverflow.com/questions/466521/how-many-files-can-i-put-in-a-directory