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Video Summary

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We have two types of memory. Read only memory (ROM) and random access memory (RAM). For RAM there is Static RAM and Dynamic RAM. SRAM is faster, more expensive, does not need refreshing and is used by the CPU to store its cache memory. DRAM is used for computer memory. SIMM, DIMM, and RIMM are the three types of RAM modules. SIMMS are no longer used in today but you might see them if you’re working on an older computer. DIMMs were the first to be synchronized with the system clock, and were referred to as Synchronous Dynamic RAM (SDRAM). DDR SDRAM and DDR2 SDRAM use dual channeling. In dual channeling both slots of the DDR must be filled with the same amount of memory. With RIMM slots all the slots must be filled either with memory modules or continuity (C-RIMM) modules. Earlier RAM had an extra bit known as parity bit to check for errors. Unfortunately, it would only detect if a bit was bad or good without a way to fix it. ECC is used in modern memory to correct memory errors at the bit level and correct any problems it may find. There are magnetic, optical, and solid state storage devices. Floppy disks and hard drives are magnetic storage devices. If exposed to a magnet data loss may result. Hard drives have a 137 GB limit. You must flash the BIOS to upgrade it and it will allow it to support a larger number of hard drive addresses. The Hard drive interfaces to attach to the motherboard are PATA/IDE, SATA, SCSI, USB, and FireWire. Along with hard drives, parallel ATA (PATA) and serial ATA (SATA) are also used for CD drives, DVD drives and tape drives. The two power supply connections are Molex and Berg. Molex connections are larger and are used for hard drives, CD drives, and DVD drives. Berg connections are smaller and are used for floppy drives. The floppy drive cable has a twist to distinguish it from the IDE cable. Optical storage devices include CD and DVD drives. Solid state storage devices include thumb drives and memory cards.

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