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The CnW Wizard will try and determine what type of disk is being read.  If a disk has very few good sectors, or is very badly corrupted, typically at the start of the disk, it can be difficult to determine.  It is also unlikely that wizard will manage recovery, so the manual operation will be required.

To determine the type of media does take experience, but the following is a brief guide for the possible types.  They fall into two categories, for CDs and DVDS, or for magnetic media such as hard drives and floppies.

CD / DVD operating systems

• ISO9660
• Joliet
• UDF
• Macintosh

For more details on recognition see How to recognise types of CD/DVD

Magnetic Media

• FAT12
• FAT16
• FAT32
• NTFS
• HFS+  (Macintosh)

For more details on recognition, see Magnetic media recognition

Once the operating system has been determined, it will be possible to start the Recovery function in the correct mode.  For CDs, this will mean selecting the correct operating system in the options box.  For magnetic media, the operating system will be entered via the partition selection routine.