ext4
| Developer(s) | Andrew Morton |
|---|---|
| Full name | Fourth extended file system |
| Introduced | October 2006 with Linux 2.6.19 |
| Structures | |
| Directory contents | Table, Tree |
| File allocation | bitmap (free space), table (metadata) |
| Bad blocks | Table |
| Limits | |
| Max volume size | 1024PiB |
| Other | |
| Supported operating systems | Linux, BSD, MacOS X |
The ext4, or fourth extended filesystem was revealed on October 10, 2006 by Andrew Morton as a compatible improvement to the ext3, featuring support for volumes up to 1024 PB and added extent support.