d1 1 INTRODUCTION TO STORAGE DEVICE

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data recovery basic introduction slides


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INTERSOFT TECHNICAL INSTITUTE : INTERSOFT TECHNICAL INSTITUTE DATA RECOVERY TRAINING Module 1 :- Logical Data Recovery Training 1

Introduction to Storage Device : Introduction to Storage Device HDD Traditional Hard disk drives Performance Storage capacity Software support Reliability Hard Disk Drive Components Disk platter Read/Write head Head arm/Head slider Head actuator mechanism Spindle motor Logic board Air filter Cables & Connectors 2

PowerPoint Presentation : 3 Storage Technologies Floppy Hard CD / DVD (Optical) ZIP / JAZZ Tape USB Pen

Difference between HDD & SDD disk drive : Difference between HDD & SDD disk drive HDD Currently 2.95/5 Rating:  2.9 /5 (56 votes) SSD Currently 3.57/5 Rating:  3.6 /5 (69 votes) Stands for: Speed : Hard Disk Drive HDD has higher latency, longer read/write times, and supports fewer IOPs (input output operations per second) compared to SSD. Solid State Drive SSD has lower latency, longer read/write times, and supports more IOPs (input output operations per second) compared to HDD. 4

PowerPoint Presentation : Heat , Electricity, Noise: Defragmentation: Weight: Components: Hard disk drives use more electricity to rotate the platters, generating heat and noise . The performance of HDD drives worsens due to fragmentation; therefore, they need to be periodically defragmented HDDs are heavier than SSD drives. HDD contains moving parts - a motor-driven spindle that holds one or more flat circular disks (called platters) coated with a thin layer of magnetic material. Read-and-write heads are positioned on top of the disks; all this is encased in a metal cas Since no such rotation is needed in solid state drives, they use less power and do not generate heat or noise . SSD drive performance is not impacted by fragmentation. Sodefragmentation  is not necessary SSD drives are lighter than HDD drives because they do not have the rotating disks, spindle and motor. SSD has no moving parts; it is essentially a memory chip. It is interconnected, integrated circuits(ICs) with an interface connector. There are three basic components - controller, cache and capacitor. 5

Types of hard disk : Types of hard disk Form factor Width Height Largest capacity Platters (Max) 3.5″ 102 mm 19 or 25.4 mm 4 TB [58][59][60] (2011) 5 2.5″ 69.9 mm 7 [61] , 9.5 [62] , 11.5 [63] , or 15 mm 1.5 TB [58][64][65] (2010) 4 1.8″ 54 mm 5 or 8 mm 320 GB [66] (2009) 3 6

Windows(FAT & NTFS) : Windows(FAT & NTFS) FAT16 Up to Windows 95 and Windows NT 4.0 Maximum storage capacity of 16GB FAT32 Windows 98, ME, 2000, XP Addresses up to 2TB 7

Fat advantages & disadvantages : Fat advantages & disadvantages FAT is “good enough” Especially for home use Old, limited, relatively simplistic Lack features needed by high-end users: Security Capacity Reliability 8

NTFS : NTFS First introduced with Windows NT Primary file system for XP Used with NT, 2000, and XP Spin off of HPFS High Performance File System Collaboration with IBM’s OS/2 NT was backwards compatible with HPFS 2000 and XP aren’t Improvements over FAT: Stores more information about a file Security features Ownership Provides more user control over files and folders 9

PowerPoint Presentation : 10 NTFS uses Unicode International data format UTF-8, UTF-16, UTF-32 UTF-8 identical to ASCII for western languages Useful for keyword searches

FAT/NTFS Comparison : FAT/NTFS Comparison FAT32 (vFAT) NTFS Systems Windows98, NT5 NT4, NT5 Maximal volume size Almost unlimited Almost unlimited Maximal files count Almost unlimited Almost unlimited File name Long names (up to 255 chars), system character set. Long names (up to 255 chars), unicode character set. File attributes Basic set All that programmers want Security No Yes (capability of physical encryption, starting from NT5.0) Compression No Yes Fault tolerance Low Fully (automatic) 11

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