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Storage and Storage Devices By  Nilabh Verma
Storage Measurement <ul><li>Bit (b) </li></ul><ul><li>Nibble (n) </li></ul><ul><li>Byte (B) </li></ul><ul><li>Kilo Byte (K...
Storage Characteristics <ul><li>Can be Internal, External & Remote </li></ul><ul><li>Are nonvolatile </li></ul><ul><li>Two...
Magnetic Disk <ul><li>Most commonly used in today's storage systems.  </li></ul><ul><li>Use mangnetic particles to store d...
Floppy Disk & Drive <ul><li>Low capacity removable disk. </li></ul><ul><li>Mostly of 3.5” and holds 1.44/2.8 MB. </li></ul...
Hard Disk Drive <ul><li>High capacity disk. </li></ul><ul><li>Most common media of storage. </li></ul><ul><li>Use one or m...
Hard Disk Drive <ul><li>High capacity disk. </li></ul><ul><li>Most common media of storage. </li></ul><ul><li>Use one or m...
Optical Disk Drive <ul><li>High capacity disk which store data optically. </li></ul><ul><li>Can be internal or external. <...
Optical Disk Drive <ul><li>Read only disks can be </li></ul><ul><ul><li>Read but no write. </li></ul></ul><ul><ul><li>CD/D...
Optical Disk Drive <ul><li>Read only disks can be </li></ul><ul><ul><li>Read but no write. </li></ul></ul><ul><ul><li>CD/D...
Flash Memory Systems <ul><li>No moving parts, less vibration, less power, makes no sound, ultra portable, easy to use. </l...
Storage for Large Computers <ul><li>Usually use a storage server. </li></ul><ul><li>Containing multiple high spped HDDs. <...
DAS, NAS and SAN <ul><li>Direct Attached Storage (DAS) </li></ul><ul><ul><li>Most basic type of storage. </li></ul></ul><u...
RAID <ul><li>Redundant Arrays of Indipendent Discs (RAID) is a method of storing data on two or more hard drives that work...
Magnetic Tape Systems <ul><li>Works similar as magnetic disk. </li></ul><ul><li>Primarily used for backup. </li></ul><ul><...
 
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Storage and Storage Devices

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Transcript of "Storage and Storage Devices"

  1. 1. Storage and Storage Devices By Nilabh Verma
  2. 2. Storage Measurement <ul><li>Bit (b) </li></ul><ul><li>Nibble (n) </li></ul><ul><li>Byte (B) </li></ul><ul><li>Kilo Byte (KB) </li></ul><ul><li>Mega Byte (MB) </li></ul><ul><li>Giga Byte (GB) </li></ul><ul><li>Tera Byte (TB) </li></ul><ul><li>Peta Byte (PB) </li></ul><ul><li>Exa Byte (EB) </li></ul><ul><li>Zetta Byte (ZB) </li></ul><ul><li>Yotta Byte (YB) </li></ul>
  3. 3. Storage Characteristics <ul><li>Can be Internal, External & Remote </li></ul><ul><li>Are nonvolatile </li></ul><ul><li>Two main things for storage: </li></ul><ul><ul><li>Device </li></ul></ul><ul><ul><li>Media </li></ul></ul><ul><li>Mainly of four types: </li></ul><ul><ul><li>Magnetic Disks </li></ul></ul><ul><ul><li>Optical Disks </li></ul></ul><ul><ul><li>Tape </li></ul></ul><ul><ul><li>Mobile Storage </li></ul></ul>
  4. 4. Magnetic Disk <ul><li>Most commonly used in today's storage systems. </li></ul><ul><li>Use mangnetic particles to store data on disk surface. </li></ul><ul><li>Data held on a disc in block fomed by tracks and sectors. </li></ul><ul><li>Tracks and sectors are created when disk is first formatted. </li></ul><ul><li>Data written and read by read/write heads. </li></ul><ul><li>Common types: </li></ul><ul><ul><li>Hard disks </li></ul></ul><ul><ul><li>Floppy disks </li></ul></ul><ul><ul><li>Zip disks </li></ul></ul><ul><li>Important to keep away from magnetic field. </li></ul>
  5. 5. Floppy Disk & Drive <ul><li>Low capacity removable disk. </li></ul><ul><li>Mostly of 3.5” and holds 1.44/2.8 MB. </li></ul><ul><li>Not widely used today. </li></ul><ul><li>Sometimes reffered as a legacy drive. </li></ul><ul><li>Generally use PATA interface. Also available in USB. </li></ul><ul><li>Zip drive works similar with 100 to 250 MB of storage. </li></ul>
  6. 6. Hard Disk Drive <ul><li>High capacity disk. </li></ul><ul><li>Most common media of storage. </li></ul><ul><li>Use one or more metal magnetic disks. </li></ul><ul><li>Can be internal, external or remote. </li></ul><ul><li>Typically holds 80 GB to several Tbs. </li></ul><ul><li>Generally use following interface: </li></ul><ul><ul><li>PATA </li></ul></ul><ul><ul><li>SATA </li></ul></ul><ul><ul><li>SCSI </li></ul></ul><ul><ul><li>USB </li></ul></ul>
  7. 7. Hard Disk Drive <ul><li>High capacity disk. </li></ul><ul><li>Most common media of storage. </li></ul><ul><li>Use one or more metal magnetic disks. </li></ul><ul><li>Can be internal, external or remote. </li></ul><ul><li>Typically holds 80 GB to several Tbs. </li></ul><ul><li>Generally use following interface: </li></ul><ul><ul><li>PATA </li></ul></ul><ul><ul><li>SATA </li></ul></ul><ul><ul><li>SCSI </li></ul></ul><ul><ul><li>USB </li></ul></ul>
  8. 8. Optical Disk Drive <ul><li>High capacity disk which store data optically. </li></ul><ul><li>Can be internal or external. </li></ul><ul><li>Can be read only, recordable or rewritable. </li></ul><ul><li>Standard sized disk is 120 mm. Minis are 80 mm. </li></ul><ul><li>Standard CD holds upto 700 MB of data. </li></ul><ul><li>Standard DVD holds 4.7 GB (single layer) or 8.5 GB (double layer) of data. </li></ul><ul><li>High definition DVD or blue-ray disks can hold upto 50 GB typically (17-27 GB) of data. </li></ul><ul><li>Generally use following interface: </li></ul><ul><ul><li>PATA </li></ul></ul><ul><ul><li>SATA </li></ul></ul><ul><ul><li>USB </li></ul></ul>
  9. 9. Optical Disk Drive <ul><li>Read only disks can be </li></ul><ul><ul><li>Read but no write. </li></ul></ul><ul><ul><li>CD/DVD of same storage capacity. </li></ul></ul><ul><li>Recordable disks can be </li></ul><ul><ul><li>Written to but can't be erased or resuse. </li></ul></ul><ul><ul><li>CD/DVD of same storage capacity. </li></ul></ul><ul><li>Rewritable disks can be </li></ul><ul><ul><li>Written, erased and overwritten just like a magnetic disk. Needs software to write (not necessary). </li></ul></ul><ul><ul><li>CD/DVD of same capacity. </li></ul></ul><ul><li>All disks use the appropriate device to perform task. DVD writer can handle almost kind of tasks. </li></ul>
  10. 10. Optical Disk Drive <ul><li>Read only disks can be </li></ul><ul><ul><li>Read but no write. </li></ul></ul><ul><ul><li>CD/DVD of same storage capacity. </li></ul></ul><ul><li>Recordable disks can be </li></ul><ul><ul><li>Written to but can't be erased or resuse. </li></ul></ul><ul><ul><li>CD/DVD of same storage capacity. </li></ul></ul><ul><li>Rewritable disks can be </li></ul><ul><ul><li>Written, erased and overwritten just like a magnetic disk. Needs software to write (not necessary). </li></ul></ul><ul><ul><li>CD/DVD of same capacity. </li></ul></ul><ul><li>All disks use the appropriate device to perform task. DVD writer can handle almost kind of tasks. </li></ul>
  11. 11. Flash Memory Systems <ul><li>No moving parts, less vibration, less power, makes no sound, ultra portable, easy to use. </li></ul><ul><li>Can be in form of USB or card flash disks. </li></ul><ul><li>Can be directly connected with system or through appropriate card reader. </li></ul><ul><li>Flash cards can be of 1 GB to 8 GB or higher. Commonly used in mobiles, gaming systems. </li></ul><ul><li>USB flash drive can be of 2 GB to 64 GB or higher. Commonly used as a magnetic disks. </li></ul>
  12. 12. Storage for Large Computers <ul><li>Usually use a storage server. </li></ul><ul><li>Containing multiple high spped HDDs. </li></ul><ul><li>Generally used in big corporates having </li></ul><ul><ul><li>Multiple servers. </li></ul></ul><ul><ul><li>Hundreds of users. </li></ul></ul><ul><ul><li>Tremendous amount of data. </li></ul></ul>
  13. 13. DAS, NAS and SAN <ul><li>Direct Attached Storage (DAS) </li></ul><ul><ul><li>Most basic type of storage. </li></ul></ul><ul><ul><li>Simple storage which is directly connect to the server. </li></ul></ul><ul><li>Network Attached Storage (NAS) </li></ul><ul><ul><li>Storage server connect to a network to provide storage for computer on that network. </li></ul></ul><ul><ul><li>Use TCP/IP protocol, Low performance. </li></ul></ul><ul><li>Storage Area Network (SAN) </li></ul><ul><ul><li>Network of storage devices that provides storage for another network of computers. </li></ul></ul><ul><ul><li>Use fiber channel. </li></ul></ul><ul><ul><li>Generally use RAID, Backup and restore, High performance, less load on network. </li></ul></ul>
  14. 14. RAID <ul><li>Redundant Arrays of Indipendent Discs (RAID) is a method of storing data on two or more hard drives that work together to do the job of larger drive. </li></ul><ul><ul><li>Usually involves recording redundant copies of stored data. </li></ul></ul><ul><ul><li>Most commonly used </li></ul></ul><ul><ul><ul><li>RAID 0: Stripping (atleast 2 disks, usage n). </li></ul></ul></ul><ul><ul><ul><li>RAID 1: Mirroring (atleast 2 disks, usage n/2). </li></ul></ul></ul><ul><ul><ul><li>RAID 5: Stripping with distributed parity (atleast 3 disks, usage n-1). </li></ul></ul></ul>
  15. 15. Magnetic Tape Systems <ul><li>Works similar as magnetic disk. </li></ul><ul><li>Primarily used for backup. </li></ul><ul><li>Low cost per MB. </li></ul><ul><li>Mostly in form of cartridge tape. </li></ul><ul><li>Can be individual or with tape library. </li></ul><ul><li>Capacity from 4 GB to several TBs. </li></ul>
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