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Hard disk  Drive
Head positioning Of a voice coil Based System ,[object Object],[object Object],[object Object],[object Object],[object Object]
Closed loop servo Read the Servo/ index information Is it the reqd. Position Move the head to next position Stop Yes No Closed Loop
Types of servo ,[object Object],[object Object],[object Object],[object Object]
Wedge servo ,[object Object],[object Object],[object Object]
 
Problem with Wedge servo ,[object Object],[object Object]
Embedded servo ,[object Object],[object Object]
 
Dedicated Servo ,[object Object],[object Object],[object Object],[object Object]
 
HDD features ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Form Factor ,[object Object],[object Object],[object Object],[object Object],[object Object]
Storage capacity ,[object Object],[object Object]
Disk Geometry ,[object Object],[object Object],[object Object],[object Object]
Sides and Heads ,[object Object],[object Object],[object Object],[object Object]
Track ,[object Object],[object Object],[object Object]
 
Sector ,[object Object],[object Object],[object Object],[object Object],[object Object]
Cylinder ,[object Object],[object Object],[object Object]
 
Calculation of storage capacity ,[object Object],[object Object]
Interleave ,[object Object],[object Object],[object Object],[object Object]
Interleave ,[object Object],[object Object],[object Object]
Interleave Factor ,[object Object],[object Object],[object Object]
Interleave factor
Zone bit recording ,[object Object],[object Object],[object Object],[object Object]
Zone bit recording
Write Pre-compensation ,[object Object],[object Object],[object Object],[object Object],[object Object]
Write Pre-compensation ,[object Object],[object Object],[object Object]
Write Pre-compensation ,[object Object],[object Object],[object Object]
Master Boot Record ,[object Object],[object Object],[object Object],[object Object]
Cluster ,[object Object],[object Object],[object Object]
Cluster ,[object Object],[object Object],[object Object],[object Object]
Default Cluster size for different volume sizes Volume size FAT 16 Cluster FAT 32 cluster NTFS cluster 7MB – 16MB 2 KB Not supported 512 bytes 17MB- 32 MB 512 bytes Not supported 512 bytes 33 MB- 64MB 1 KB 512 bytes 512 bytes 65MB – 128MB 2KB 1 KB 512 bytes 129 MB – 256 MB 4 KB  2 KB 512 bytes 257 KB- 512 MB 8 KB 4 KB 512 bytes 513 MB -1024 MB 16 KB 4 KB 1 KB 1o25 MB-2 GB 32 KB 4 KB 2 KB 2 GB -4 GB 64 KB 4KB 4KB 4 GB – 8 GB Not supported 4KB 4KB 8GB -16 GB Not supported 8 KB 4KB 16 GB- 32 GB Not supported 16 KB 4KB 32 GB- 2 TB Not supported Not supported 4 KB
Logical Structure of HDD Physical Sector Partition1(C:) (Logical sector 1) Partition 2 (D:) (logical sector 2) DOS Boot record  FAT 1 FAT 2 Root  Direc- tory Data Area DOS Boot record  FAT 1 FAT 2 Root  Direc- tory Data Area
Logical structure ,[object Object],[object Object],[object Object]
Formatting ,[object Object],[object Object],[object Object]
Low level formatting ,[object Object],[object Object],[object Object]
Functions of low level formatting ,[object Object],[object Object],[object Object],[object Object]
High level formatting ,[object Object],[object Object],[object Object]
Partitioning ,[object Object],[object Object],[object Object],[object Object]
Partitioning ,[object Object],[object Object],[object Object],[object Object],[object Object],Size of logical Drive (MB) Cluster size in KB 0-15 4 16- 127 2 128 -255 4 256 -511 8 512 - 1023 16 1024 – 2047 32 2049- 4095 64
Partition ,[object Object],Configure the system BIOS setup Low level formatting Partitioning (FDISK) High level formatting
Partitioning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Chap2 hdd2

  • 1. Hard disk Drive
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  • 3. Closed loop servo Read the Servo/ index information Is it the reqd. Position Move the head to next position Stop Yes No Closed Loop
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  • 35. Default Cluster size for different volume sizes Volume size FAT 16 Cluster FAT 32 cluster NTFS cluster 7MB – 16MB 2 KB Not supported 512 bytes 17MB- 32 MB 512 bytes Not supported 512 bytes 33 MB- 64MB 1 KB 512 bytes 512 bytes 65MB – 128MB 2KB 1 KB 512 bytes 129 MB – 256 MB 4 KB 2 KB 512 bytes 257 KB- 512 MB 8 KB 4 KB 512 bytes 513 MB -1024 MB 16 KB 4 KB 1 KB 1o25 MB-2 GB 32 KB 4 KB 2 KB 2 GB -4 GB 64 KB 4KB 4KB 4 GB – 8 GB Not supported 4KB 4KB 8GB -16 GB Not supported 8 KB 4KB 16 GB- 32 GB Not supported 16 KB 4KB 32 GB- 2 TB Not supported Not supported 4 KB
  • 36. Logical Structure of HDD Physical Sector Partition1(C:) (Logical sector 1) Partition 2 (D:) (logical sector 2) DOS Boot record FAT 1 FAT 2 Root Direc- tory Data Area DOS Boot record FAT 1 FAT 2 Root Direc- tory Data Area
  • 37.
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