pengantar teknologi informasi 4. secondary storage

Pengantar Teknologi Informasi

4. Secondary Storage

Pengertian

Storage : tempat penyimpanan Secondary Storage Storage Media

Tujuan

Menyimpan data dan program : Permanen, tidak tergantung pada

catu daya Backup, cadangan, keamanan Distribusi, memindahkan

Representasi Data

Standard representasi: ASCII EBCDIC UNICODE

ASCII

Representasi biner

Biner: data disimpan sebagai state

ON = 1 OFF = 0

Standard Jumlah kode

ASCII = American Standard Code for Information Interchange; ASCII-8 : 8 bit = 256 chars (0-255)

EBCDIC = Extended Binary Coded Decimal Interchange Code; 256 chars

UNICODE; 65536Jika •1 huruf diwakili 1 char, dan•1 char ASCII-8 memerlukan tempat penyimpanan 8 bit (=1 byte),maka berapakah tempat untuk menyimpan “FE UNPAR” ?Berapa memory untuk menyimpan “FE UNPAR” dalam UNICODE?

Satuan 1 Byte = 8 bit 1 Kilobyte (KB) = 1024 Byte 1 Megabyte (MB)=1024 KB 1 Gigabyte (GB) = 1024 MB 1 Terabyte (TB) = 1024 GB

bites?

1 MegaByte = 1,024 x 1,024 Bytes

1 MegaByte = 1,048,576 Bytes

Kb = Kilobits

KB = KiloBytes

Jenis

Media penyimpanan: Magnetic Optical disk (Removable) Solid-state Storage

Device

Magnetic

Magnetic Tape Sequential Access Storage Device

(SASD) Magnetic Disk

Direct Access Storage Device (DASD)

Magnetic Tape

Sequential Access Storage Device (SASD) Makin jarang digunakan, tapi masih ada

dipakai untuk backup

Magnetic Disk Floppy disk (diskette) Hard disk

Magnetic Disk: diskette Bahan Bagian

Track Sector

Floppy Disk (1) Ukuran

Floppy Disk (2) Formatting

Soft-sector Hard-sector

Kepadatan rekam Single Density Double Density Quad Density High Density

Sisi rekam Single Side Double Side

Floppy Disk (3) Cluster : beberapa sector sebagai

satu blok data Seandainya 1 cluster = 4 KB, maka

File 3 KB memerlukan 1 cluster (4 KB) File 5 KB memerlukan 2 cluster (8 KB)

Standard: FAT16 (DOS, Win31, Win95) = 32 KB FAT32 (Win98, XP) = 4 KB

Floppy Disk (3a)

Diketahui disket, free space 100 KB

Seandainya 1 cluster = 4 KB Disimpan file ukuran 5 KB Free space saat ini menjadi: 92 KB

Floppy Disk (4)

High-capacity floppy disk Zipdisk (Iomega) Superdisk (Imation) HiFD disk (Sony)

Hard Disk (1)

Hard Disk (2) Seperti floppy

Hard Disk (3) Seperti floppy, bahan logam

Hard Disk (4)

Seperti floppy, Beberapa piringan, cylinder

Hard disk (5)

Speed: rotations per minute (rpm) Capacity: Giga Byte (GB) Transfer rate: Mega bit per second

(Mbps) Controller: IDE, ATA, EIDE ...

Hard disk (6) : varian

Removable hard disk Redundant Array of Inexpensive

Disks (RAID) Small Computer System Interface

(SCSI)

Hard disk, removable

bracket

•USB v1.1 data transfer 12Mbits/sec.

•Compatible with almost every 2,5" hdd.

•Hot swappable function. Included Win98/98se driver. Works without driver direct with Win ME/2000/XP, linux.

Hard Disk : raid 5

High capacity Mirroring Fault tolerant Stripping

Optical Disk

Optical Disk

ROM : Read Only Memory WORM : Write Once, Read Many

CD-Recordable (CDR) Menulis CD dengan cara membakar

(burn) permukaan piringan WMRM : Write Many Read Many

ReWrite CD (CDRW)

Optical Disk CD (Compact Disk) :

CD-ROM CD-R CD-RW mini-CD

DVD (Digital Video Disk, Digital Versatile Disk) :

DVD-ROM DVD-R DVD-RAM

CD Format: CD-Audio, CD-ROM (ISO), VCD,

SVCD, CD-I, .. Kapasitas:

Mini CD: 200 MB CD : 650 – 700 MB DVD : 4.7 GB – 17 GB

Transfer rate: CD drive : 1x = 150 KBps DVD drive: 1x = 1.32 MBps

Fluorescent Multilayer Disk Capacity : 20 GB – 140 GB Transfer rate : 1 GBps

Solid State

Holographic