Hard Disk Storage is a part of computer which can save and process data

Hard Drive History and Advancements

1. Maximum storage capacities have increased from the 5MB and 5.25-inch full-height drives available in 1982
2. The first hard drive in 1983 was a 10MB .
3. Data-transfer rates to and from the media (sustained transfer rates) have increased from between 85KBps to 102KBps for the original IBM XT in 1983
   
   

   AREAL DENSITY

   Areal density is defined as the product of the linear bits per inch (bpi), measured along the length of the tracks around the disk, multiplied by the number of tracks per inch (tpi), Each track is divided into sectors

   Note that each sector is delineated by gaps in the recording, which precede and follow the track and sector headers (where ID and address information resides)
   
   

   HARD DISK DRIVE OPERATION

   preparing a hard disk drive for data storage involves three steps:
   

   • *Low-level formatting (LLF)
   • *Partitioning
   • * File Allocation Table (FAT)
   • * File Allocation Table, 32 bit (FAT32)
   • * Windows NT File System (NTFS)
   • *High-level formatting (HLF)

   
   

   Disk Formatting

   Two formatting procedures are required before you can write user data to a disk:
   

   • * Physical (low-level) formatting
   • * Logical (high-level) formatting

   
   Basic Hard Disc Drive Component
   
   The basic components of a typical hard disk drive are as follows:
   
   

   • Disk platters
   • Read/write heads
   • Head actuator mechanism
   • Spindle motor (inside platter hub)
   • Logic board (controller or printed circuit board)
   • Cables and connectors
   • Configuration items (such as jumpers or switches)

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