pengantar teknologi informasi 4. secondary storage
TRANSCRIPT
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Pengantar Teknologi Informasi
4. Secondary Storage
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Pengertian
Storage : tempat penyimpanan Secondary Storage Storage Media
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Tujuan
Menyimpan data dan program : Permanen, tidak tergantung pada
catu daya Backup, cadangan, keamanan Distribusi, memindahkan
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Representasi Data
Standard representasi: ASCII EBCDIC UNICODE
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ASCII
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Representasi biner
Biner: data disimpan sebagai state
ON = 1 OFF = 0
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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?
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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
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Jenis
Media penyimpanan: Magnetic Optical disk (Removable) Solid-state Storage
Device
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Magnetic
Magnetic Tape Sequential Access Storage Device
(SASD) Magnetic Disk
Direct Access Storage Device (DASD)
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Magnetic Tape
Sequential Access Storage Device (SASD) Makin jarang digunakan, tapi masih ada
dipakai untuk backup
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Magnetic Disk Floppy disk (diskette) Hard disk
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Magnetic Disk: diskette Bahan Bagian
Track Sector
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Floppy Disk (1) Ukuran
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Floppy Disk (2) Formatting
Soft-sector Hard-sector
Kepadatan rekam Single Density Double Density Quad Density High Density
Sisi rekam Single Side Double Side
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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
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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
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Floppy Disk (4)
High-capacity floppy disk Zipdisk (Iomega) Superdisk (Imation) HiFD disk (Sony)
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Hard Disk (1)
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Hard Disk (2) Seperti floppy
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Hard Disk (3) Seperti floppy, bahan logam
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Hard Disk (4)
Seperti floppy, Beberapa piringan, cylinder
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Hard disk (5)
Speed: rotations per minute (rpm) Capacity: Giga Byte (GB) Transfer rate: Mega bit per second
(Mbps) Controller: IDE, ATA, EIDE ...
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Hard disk (6) : varian
Removable hard disk Redundant Array of Inexpensive
Disks (RAID) Small Computer System Interface
(SCSI)
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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.
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Hard Disk : raid 5
High capacity Mirroring Fault tolerant Stripping
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Optical Disk
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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)
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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
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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
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Fluorescent Multilayer Disk Capacity : 20 GB – 140 GB Transfer rate : 1 GBps
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Solid State
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Holographic