| OS | Man Page | Section | Hits |
|---|---|---|---|
| linux | hdio | 7i | 441 |
| opensolaris | hdio | 7i | 423 |
| sunos | hdio | 7i | 394 |
| centos | hdio | 7i | 387 |
| xfree86 | hdio | 7i | 385 |
| redhat | hdio | 7i | 385 |
| mojave | hdio | 7i | 377 |
| minix | hdio | 7i | 372 |
| php | hdio | 7i | 367 |
| hpux | hdio | 7i | 360 |
| osx | hdio | 7i | 345 |
| v7 | hdio | 7i | 340 |
| debian | hdio | 7i | 338 |
| suse | hdio | 7i | 337 |
| opendarwin | hdio | 7i | 334 |
| freebsd | hdio | 7i | 265 |
| bsd | hdio | 7i | 264 |
| plan9 | hdio | 7i | 247 |
| posix | hdio | 7i | 241 |