MECH 2301 Lecture 33: MECH 2301 Lecture 33 Notes
22 May 2018
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MECH 2301 Lecture 33 Notes
Introduction
Free Space Management
• Specifically to support large files and large disks, to provide file security, to reduce
access times, and to provide recovery capability.
• NTFS operates on volumes.
• In Windows NT volumes were determined solely by the layout of logical disk partitions.
• A volume in Windows NT was created by creating a logical disk partition, using the
Windows NT fault-tolerant disk manager.
• Current versions of Windows continue to support the Windows NT disk manager for
legacy volumes
• New volumes in Windows are created and managed by a disk manager, which allows the
creation of volumes dynamically.
• Newer Windows volumes need not correspond to logical disk partitions.
• Dynamic volumes can be expanded or contracted to meet changing user needs while
the system is online.
• Volumes may occupy part of a disk or an entire disk or may span multiple disks.
• Like other systems, the NTFS volume allocates space in clusters.
• Each cluster is made up of a contiguous group of sectors.
• The NTFS cluster size is set when the volume is created.
• The default cluster size is generally 4 KB or less, even for large disks.
• The layout for an NTFS volume.
• The core of each volume is a single file called the master file table (MFT).
• The master table is configured as an array of file records.
• Each record is 1 KB in size, regardless of the volume cluster size.
• The number of rows is set at volume creation time.
• The array contains one row for each file in the volume.
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