SSD - Solid State Drive PPT by Shyam jos


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A college seminar on SSD - Solid State Drive download the missing video in the slide from here


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Solid State Drive (SSD):

Solid State Drive (SSD) Presented By: Shyam Jos


Contents Introduction Form factor Architecture & Function SSD vs HDD – Start-Up Test Technical Comparison of SSD & HDD Advantages Disadvantages SSD Applications Conclusion


Introduction In 1995 , M-Systems introduced first flash-based solid-state drives. A solid-state drive (SSD) is a data storage device  that uses solid state memory to store persistent data and SSDs use same I/O interfaces developed for hard disk drives. SSDs do not have any moving mechanical components, which distinguishes them from traditional magnetic disks such as hard disk drives (HDDs). SSDs use NAND-based flash memory or DRAM to store data.

Form Factor:

Form Factor Standard HDD form factors Box form factors Bare-board form factors Ball grid array form factors

Form Factor:

Form Factor Standard HDD form factors – is equal to size of traditional HDD form factors like 3.5", 2.5” 2.55’’ HDD form factor

Form Factor:

Form Factor Box form factors – mainly used by DRAM based SSDs ,as they need external power supply or battery pack. Box form factor

Form Factor:

Form Factor Bare-board form factors - Form factor which were more common to memory modules(RAM) Bare-board form factor

Form Factor:

Form Factor Ball grid array form factors - small chip package size to fit into Embeded systems Bare-board form factor

Architecture & Function:

Architecture & Function Block Diagram


Memory Flash memory-based SSDs: use non-volatile NAND flash memory Ability to retain the data without a constant power supply lower cost compared to DRAM Flash memory SSDs are slower than DRAM solutions. DRAM-based SSDs: Based on volatile memory such as DRAM internal battery or an external AC/DC adapter is needed to hold the data ultrafast data access primarily to accelerate applications Higher cost compared to NAND flash memory


Controller The controller is an embedded processor and executes firmware-level code. Functions: Error correction (ECC) Wear leveling Bad block mapping Read scrubbing and read disturb management Read and write caching Garbage collection Encryption

Cache or Buffer::

Cache or Buffer: A flash-based SSD typically uses a small amount of DRAM as a cache, similar to the cache in hard disk drives.

Host interface:

Host interface Serial ATA (SATA) SAS - Serial attached SCSI (generally found on servers) PCI Express Fibre Channel (almost exclusively found on servers) USB Parallel ATA (IDE) interface (mostly replaced by SATA)

SSD vs HDD - Start-Up Speed Test :

SSD vs HDD - Start-Up Speed Test This video shows the speed differeence between a solid state drive and standard hard drive on a Windows 7 PC.

Technical Comparison of SSD & HDD :

Technical Comparison of SSD & HDD Solid-state drive Hard disk drive Random access time 0.1 ms Random access time 5~10 ms Read latency time Very low Read latency time high 100MB/s to 500MB/s 50MB/s to 100MB/s. High Reliability SSDs have no moving parts to fail mechanically. Low Reliability HDDs have moving parts and are subject to sudden failure; small and light in weight. relatively large and heavy In 2013 SSDs were available in sizes up to 512GB, In 2013 HDDs of up to 4TB were available. power consuption 2 watts 12 watts. As of 2013 NAND flash SSDs cost about Rs.31000 for 500GB As of 2013 HDDs cost about Rs.3200 for 500GB drives


Advantages High performance – siginificantly faster than a standard HDD Faster seek time – upto 60x faster than HDD Higher reliablity – no moving parts,can withstand 1500Gs operating shock Lower power – Lesser power consuption ,cooler operation Silent operation – ideal for post production enviornments Lighter weight – perfect for portable devices Wider operating Temp. - 0c – 70c


Disadvantages They are more expensive than traditional hard drives They currently offer less storage space than traditional hard drives. Slower Write Speed on low-end Models(MLC based types)

SSD Applications:

SSD Applications Servers Desktop computers Laptops Ultrabooks HD Camcorders Smart Tv CCTV Digital Video Recorder (DVR) Set-Top Boxes Gaming Consoles


Conclusion Faster Data Access Less Power Usage Higher Reliability Latest high-end laptops and ultrabooks now comes with SSD In comming years SSD Will Replace Hard Disk Drives

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