Hard disks are non volatile storage devices that can preserve data without electrical power. Even though the power is off, data is not lost from hard disk. This is only component in your system that can store and retain data. These disks are operated by running needles across a spinning disk. When hard disk are installed in your system it makes use of three components called jumpers, hard disk interface and power connector. A jumper is a connector that acts as an on or off switch for hard disk. Hard disk interface attaches disk to system. Power connector is used to connect hard disk into power supply of your system. When platters in a hard disk starts spinning, read or write head moves into a position from where it can read data from disk. Tracks are circles on the disk where data is saved on the magnetic surface of the platter. As hard disks are present inside your computer it is able to access and process the data faster than any other removable storage media. Hard disk are preformatted when they are manufactured. If they are not formatted, you have to format them while installing OS. To organize and locate data stored on hard disk, file systems are used. These control the directories and files that are stored on disk. The various file systems used by the Mac OS X are HFS, HFS+, HFSX, FAT16 and FAT32.
Mac OS X is also prone to corruption like other operating system due to corruption of volume header, improper shut down of Mac, Disk verify and Repair tool fails etc. These scenarios lead to data loss from Mac where you have to rely on mac disk recovery to recover lost data.
In previous versions of Mac OS, file consists of two parts i.e., data fork where data is stored and resource fork where file meta data, application information are stored. HFS+ can store two pieces of meta data i.e., creation date and modification date of a file. This file system is more concern how to allow files to store in multiple forks. Using Mac OS X 10.6, disk utility can be used to divide single volume into multiple volumes without reformatting original volume. The File Manager Utility takes care of reading, writing and storing data on physical media. This also collects data to retain HFS and controls files, directories and other items.
Remo Recover (Mac) Basic edition is capable of recovering files from HFS+, HFSX, FAT16, FAT32 partitions or volumes. This software performs thorough scanning to recover lost files from inaccessible volumes. This software has the capability to recover files from accidentally formatted Mac volumes. This utility has the ability to locate and recover files from accidentally deleted volumes. This tool is capable of recovering files from SATA, SCSI, IDE hard drives, USB external drives, different flash memory cards like SD cards, XD cards, MMC, Memory sticks, FireWire Drives, iPods etc. When you download demo version of the tool, you are provided to preview recovered data prior to restoration.