Installing, Configuring, and Troubleshooting Storage Devices Flashcards
What is system memory
The main storage area for programs and data when the computer is running.
What is RAM
(random access memory) The principal storage space for computer data and program instructions.
What is a volatile memory
A type of memory where data cannot be stored without power being supplied.
Definition of virtual memory
An area on the hard disk is allocated to contain pages of memory.
Defintion of DRAM
A type of volatile memory that stores each bit of data as a charge within a single transistor.
Definition of SDRAM
A variant on the DRAM chip is designed to run at the speed of the system clock, thus accelerating the periodic refresh cycle times.
What does do DRAM in a PC
Stores each data bit as an electrical charge within a single bit cell.
Bit cell is composed of a capacitor and a transistor.
The charge dissipates, causing the memory to lose information.
Dynamic memory has to be refreshed to keep the information.
What does do SDRAM in PC
Older technology.
Synchronized to the system clock.
What is DDR SDRAM
The standard for SDRAM is where data is transferred twice per clock cycle.
Examples of DDR Standards
Examples of DDR Standards:
DDR2 – 1066/PC28500:
Memory works at 266 MHz, bus works at 533 MHz.
The double data rate gives 1066 MT/s.
Nominal transfer rate of 8.533 Gbps.
DDR3 – 1600/PC321800:
Memory works at 200 MHz, bus works at 800 MHz.
The double data rate gives 1600 MT/s.
Nominal transfer rate of 12.8 Gbps.
DDR4 – 1600/PC4-12800:
Memory works at 200 MHz, bus works at 800 MHz.
The double data rate gives 1600 MT/s.
Nominal transfer rate of 12.8 Gbps.
Lower voltage, so less power consumption than DDR3.
DDR4 – 2400/PC4-19200: Memory works at 300 MHz, bus works at 1200 MHz. The double data rate gives 2400 MT/s. Nominal transfer rate of 19.2 Gbps. Faster than any DDR3.
Definition of a Memory Module
A printed circuit board that holds a group of memory chips that act as a single unit.
What is DIMM
(dual inline memory module) Standard packaging for system memory. There are different pin configurations for different RAM types.
Where is the Memory Module located
Located in slots on the motherboard.
True or False
Memory Modules are not removable and replaceable
False
Memory Modules are removable and replaceable
How are Memory Modules defined
Defined by their design and by the number and type
of chips contained.
What are the pins and voltage for these RAM Types: DDR DDR2 DDR3 DDR4
RAM Type
DDR: (voltage: 2.5 to 2.6 V) (pins: 184)
DDR2: (voltage: 1.8 to 1.9 V) (pins: 240)
DDR3: (voltage: 1.35 to 1.5 V) (pins: 240)
DDR4: (voltage: 1.2 V) (pins: 288)
Definition of SODIMM
Memory that is half the size of DIMMs, is available in 32- or 64-bit data paths, and is commonly found in laptops and iMac systems.
In what computer system does SODIMM occur.
Laptop RAM
What RAM type does SODIMM have the same amount of pins.
DDR and DDR2 have the same number of pins, but the key position is different.
How does SODIMM typically fit into a slot
Typically fits into slots that pop up at a
45º angle to allow the chips to be inserted or removed.
What are the pin packages for SODIMM?
Pins:
DDR 200 pin packages.
DDR2 200 pin packages.
DDR3 204 pin packages.
DDR4 260 pin packages.
The definition of single-channel memory?
Memory with one 64-bit bus between the CPU and RAM.
The definition of dual-channel memory?
Memory controller with two pathways to the CPU, enabling 128 bits of data transferred per transaction.
How many pathways does a memory module have?
Effectively two pathways through the bus to the CPU.
How many bits does a memory module have?
128 bits of data can be transferred per transaction.
What should memory modules be identical in?
Speed Capacity Chip number Density Location
Definition of Parity Checking
An error-checking method where each byte of data in memory is accompanied by a ninth bit is used to check for corrupted data.
Definition of Nonparity
The system memory does not perform error checking.
Definition of ECC memory
RAM with built-in error correction security.
What is Parity Checking
Uses 8 bits for memory and 1 bit to check parity.
Old technology is rarely if ever used now.
