iDisk was a file hosting service offered by Apple to all MobileMe members that enabled them to store their digital photos, films and personal files on-line so they could be accessed remotely. With a standard subscription, MobileMe users received a 20 GB iDisk.
iDisk integrated with Mac OS X, appearing as a network drive. Mac OS X v10.3 through v10.6 could cache updates to an iDisk volume while off-line and synchronize updates later. Any WebDAV client could also access an iDisk volume.
From 2000-2002, iDisk was free for all Mac users through iTools, a group of services that evolved into .Mac, and then after a name change in 2008 became MobileMe.
- The "Sites" folder of a MobileMe iDisk contained the files created by HomePage, the MobileMe online web authoring tool.
- The "Web" folder of a MobileMe iDisk contained the files created by iWeb, part of the iLife suite.
- The "Software" folder of a MobileMe iDisk contained MobileMe exclusive software, such as GarageBand Jam Packs.
- The "Public" folder of a MobileMe iDisk was used to host downloads.
The "Public", "Sites" and "Web" folders were the only ones which could be accessed by people other than the iDisk owner, but the "Public" folder could be made password protected via the MobileMe Preference Pane in Mac OS X.
Backup application 
Included with iDisk in the MobileMe bundle was Backup, a software utility that allowed users to back up local files to an iDisk. The software was also used to restore files from the iDisk, or any other drive/location selected in the backup app.
See also 
- "Frequently asked questions about the MobileMe transition and iCloud". Apple.com. Retrieved 2012-06-27.
- Me.com – Apple user website from which MobileMe users access their iDisk online.
- How to copy someone's else folders from public.me.com with a wget-like tool?