iDisk is a service offered by Apple, which is touted as a personal hard disk
on the Internet. iDisk allows Mac users to store files on Apple's servers
and access them online from any Internet-connected computer (Mac or
Windows). A Mac account comes with 250 MB of combined iDisk and Mac Mail storage and 3 GB of data transfer per month. Mac Mail is available to users for a free 60 day trail,
after which it is a paid subscription service.
Apple Mac Apple's Mac Internet Services for Mac OS.