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TDTS LE
Android's software instructions & data reside in two different types of storage. See en.wikipedia.org/wiki/Computer_data_storage
03-Oct-2011 According to Wikipedia policies every article should be built on the basis of reliable and published secondary sources
Real-time Formation of Collective Memories of Revolutions that every article is based on reliable and published secondary sources and not on first-.
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main memory (RAM) local secondary storage (local disks SSDs) Larger Slower Cheaper storage devices remote secondary storage (distributed file systems Web servers) Local disks hold files retrieved from disks on remote network servers Main memory holds disk blocks retrieved from local disks L1 cache CPU registers hold words retrieved from L1/L2
– Recent Memory – Orientation – Language (i e rambled speech mumbling difficult to understand) – Perceptual Disturbance • Associated Features – Change in sleep-wake cycle – Change in emotional states – Worsening of behavioral problems in the evening
Secondary Memory Block:Unit of transfer between memory and cache Managing the Hierarchy registers ? memory By compiler (or assembly level programmer) cache ? main memory By the cache controller hardware We are here main memory ? disks (secondary storage) By the OS (virtual memory which is a later topic)
Secondary Storage 8- Introduction Data storage has expanded from text and numeric files to include digital music files photographic files video files and much more These new types of files require secondary storage devices with much greater capacity than floppy disks
I Secondary Memory In the previous lecture we saw that RAM is expensive and has a limited storage capacity Since it is a volatile memory it cannot retain information after the computer is powered off Thus in addition to primary memory an auxiliary or secondary memory is required by a computer The secondary memory is also called the storage
the LRU and FIFO memory-management algorithms that uses competitive analysis to com-pare their performance to that of the optimal algorithm The book closes with Chapter 12 on the VLSI model for integrated circuits In this model both chip area A and time T are important and methods are given for deriving lower bounds on measures such as AT2
What is the purpose of secondary memory?
Secondary memory is computer memory that is non-volatile and persistent in nature and is not directly accessed by a computer/processor. It allows a user to store data that may be instantly and easily retrieved, transported and used by applications and services. Secondary memory is also known as secondary storage.
What is the difference between primary and secondary memory?
Primary memory (RAM) is faster but does not store data permanently, instead of loading secondary memory slower data in the primary memory to make efficient use of it. Unlike primary memory, secondary memory also does not access the CPU directly from the computer.
What are the different types of secondary memory?
Secondary memory is also known as external memory or auxiliary memory that is capable to store data in gigabytes and terabytes. It is also known as backup storage or mass storage media. Examples of Secondary memory are Magnetic tapes, Hard Disc, Compact Disk, Pen drive, Flash Drive, SSDs, Optical drives etc.
How much storage capacity does secondary memory have?
Secondary memory is slower than primary memory but can store and retain data, even if the computer is not connected to electrical power. It also has substantial storage capacities, ranging from megabytes to several terabytes of storage space within single memory.
The Android Linux Kernel (Part 1): Primary & Secondary Storage