05-11-2012, 04:24 PM
Solid State Drives( SSD )
Solid State Drives.pptx (Size: 243.16 KB / Downloads: 29)
introduction
The SSD (Solid State Drive) : sometimes improperly referred to as “Solid State Disk or an electric disk” is a data storage device that uses integrated circuit assemblies as memory to store data persistently.
SSD technology uses electronic interfaces compatible with traditional block (I/O) hard disk drives.
SSDs do not employ any moving mechanical components, which distinguishes them from traditional magnetic disks such as hard disk drives (HDDs) or floppy disks, which are electromechanical devices containing spinning disks and movable read/write heads.
Compared with electromechanical disks, SSDs are typically less susceptible to physical shock, are silent, and have lower access time
Development And History
SSD’s using RAM :
The origins of SSDs came from the 1950s and used two similar technologies: magnetic core memory and card capacitor read-only store (CCROS).[These auxiliary memory units, as they were called at the time, emerged during the era of vacuum tube computers. But with the introduction of cheaper drum storage units, their use was discontinued.
In the late 1970s, General Instruments produced an electrically alterable ROM (EAROM) which operated somewhat like the later NAND flash memory. Unfortunately, a ten-year life was not achievable and many companies abandoned the technology.
Architecture & Design
The key components of an SSD are
1: the controller
2: the memory
The primary memory component in an SSD had been DRAM volatile memory since they were first developed, but since 2009 it is more commonly NAND flash non-volatile memory, Other components play a less significant role in the operation of the SSD and vary among manufacturers.
Controller :
Every SSD includes a controller that incorporates the electronics that bridge the NAND memory components to the host computer.
It is one of the most important factors of SSD performance.
Functions performed by the controller Are:
1. Error correction (ECC)
2. Wear leveling
3. Bad block mapping
4. Read scrubbing and read disturb management
5. Read and write caching
6. Garbage collection
7. Encryption
Myths with SSD’s :
Solid state drives are too expensive for mainstream computing
Today, the proven performance of MLC NAND-based SSDs is enabling more consumer-oriented prices. SSDs for notebook computers are most suitable for users who value increased reliability, ruggedness and performance.
All SSDs have similar performance
there can be a significant difference in performance from one SSD to another
SSD capacities are too small
SSDs are now available in many capacities, including high-capacity drives of 256GB and 512GB for mobile computer users.
Solid State Drives.pptx (Size: 243.16 KB / Downloads: 29)
introduction
The SSD (Solid State Drive) : sometimes improperly referred to as “Solid State Disk or an electric disk” is a data storage device that uses integrated circuit assemblies as memory to store data persistently.
SSD technology uses electronic interfaces compatible with traditional block (I/O) hard disk drives.
SSDs do not employ any moving mechanical components, which distinguishes them from traditional magnetic disks such as hard disk drives (HDDs) or floppy disks, which are electromechanical devices containing spinning disks and movable read/write heads.
Compared with electromechanical disks, SSDs are typically less susceptible to physical shock, are silent, and have lower access time
Development And History
SSD’s using RAM :
The origins of SSDs came from the 1950s and used two similar technologies: magnetic core memory and card capacitor read-only store (CCROS).[These auxiliary memory units, as they were called at the time, emerged during the era of vacuum tube computers. But with the introduction of cheaper drum storage units, their use was discontinued.
In the late 1970s, General Instruments produced an electrically alterable ROM (EAROM) which operated somewhat like the later NAND flash memory. Unfortunately, a ten-year life was not achievable and many companies abandoned the technology.
Architecture & Design
The key components of an SSD are
1: the controller
2: the memory
The primary memory component in an SSD had been DRAM volatile memory since they were first developed, but since 2009 it is more commonly NAND flash non-volatile memory, Other components play a less significant role in the operation of the SSD and vary among manufacturers.
Controller :
Every SSD includes a controller that incorporates the electronics that bridge the NAND memory components to the host computer.
It is one of the most important factors of SSD performance.
Functions performed by the controller Are:
1. Error correction (ECC)
2. Wear leveling
3. Bad block mapping
4. Read scrubbing and read disturb management
5. Read and write caching
6. Garbage collection
7. Encryption
Myths with SSD’s :
Solid state drives are too expensive for mainstream computing
Today, the proven performance of MLC NAND-based SSDs is enabling more consumer-oriented prices. SSDs for notebook computers are most suitable for users who value increased reliability, ruggedness and performance.
All SSDs have similar performance
there can be a significant difference in performance from one SSD to another
SSD capacities are too small
SSDs are now available in many capacities, including high-capacity drives of 256GB and 512GB for mobile computer users.