BTEC Level 3 Unit 2. Computer Components
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1 BTEC Level 3 Unit 2 1 Computer Components
2 Stores: The Operating System Application files User data 3.5 inch units in servers and desktops 2.5 inch units in notebooks and external drives Computer Components 2
3 A typical hard disk today, would provide 250 GBs with an access time of 8.5 milliseconds, compared to 10 MBs and access times of 87 milliseconds in the 1980 s. Hard Disk Video Platter Is the actual disk, made from aluminium or glass and are therefore hard/solid as apposed to floppy disks, the actual platter is not magnetic. Coating The Platter is typically coated in a magnetised (Iron-Oxide) material (Cobalt oxide in new disks), to allow it to store a magnetic pattern that will represent the computers data. The future looks to be Solid State hard drives. Computer Components 3
4 Platter/s 2 writeable sides, magnetic coating Tracks Concentric circles Sectors Typically 512 bytes (smallest storage unit of the hard disk) Cylinders? Computer Components 4
5 Cylinders when hard disks have more than one platter, the read/write heads are mechanically linked and are therefore placed over a set of tracks at any one time! Question How many tracks are being read on the above image at any time? This collection of tracks is known as a cylinder. Computer Components 5
6 A more recent permanent storage technology Faster read and write access Typically a 2.5 inch drive Less power, heat and No moving parts. Can withstand more vibration. More expensive than traditional drives. 4TB soon to be 8TB (SanDisk) Computer Components 6
7 Three main standards: PATA Parallel Advanced Technology Attachment SATA Serial Advanced Technology Attachment SCSI Small Computer System Interface Computer Components 7
8 Principal interface for many years Two drive controllers IDE 1 or PRI IDE IDE 2 or SEC IDE Motherboards with SATA typically have one PATA for compatibility One IDE (Integrated Drive Electronics) channel supports 2 devices a master and a slave Computer Components 8
9 40 pin connector 80 wire shielded cable required for UDMA4 or better Colour coded cable select cables avoid master/slave How to cable? Motherboard connector blue Master connector black Slave connector grey Pin 1 has a red stripe Connectors are keyed Computer Components 9
10 Record the manufacturer name, size (3.5/2.5) and capacity of the hard disks within the PC. Is the drive IDE or SATA? Is the drive connected to the Primary/secondary controller? Is the drive configured as a master or slave? Is the cable the correctly orientated? we will later confirm this within the BIOS. Computer Components 10
11 Hot Swappable No Master and Slave configuration Original standard support for 150 MBps and now 300,MBps, 6 gbps Universal connector for 2.5/ 3.5 drives and servers esata allows for external connection with 2M cable Computer Components 11
12 Computer Components 12
13 Parallel Serial Input/Output Male/Female Cabling Twisted pair Coaxial Optical Computer Components 13
14 Identify the ports pictured beneath. Computer Components 14
15 RAM Random Access Memory ROM Read Only Memory Cache Fast memory that does not need to be refreshed. L1Cache L2 Cache L3 Cache Computer Components 15
16 L1-cache The fastest cache and it usually comes within the processor chip itself. L1 cache typically ranges in size from 8KB to 64KB and uses the highspeed SRAM (static RAM) instead of the slower and cheaper DRAM (dynamic RAM) used for main memory. The Intel Celeron processor uses two separate 16KB L1 caches, one for the instructions and one for the data. L2-cache Lives between L1 and RAM (processor-l1-l2-ram) and is bigger than the primary cache (typically 64KB to 4MB). L3-cache Not found nowadays as its function is replaced by L2 cache. L3 caches are found on the motherboard rather than the processor. It is kept between RAM and L2 cache. Computer Components 16
17 SDRAM Random Access Memory This is where software and programs once loaded are stored (re-open application). When the CPU runs a program it fetches data from the RAM. RAM is volatile which means it can be, changed destroyed,deleted and replaced when needed. Currently a DIMM format Sizes of DDR2 2GB (8GB) to DDR4 64 GB (128GB). Computer Components 17
18 Identify the location of the RAM inside the given PC Remove the RAM, identify the RAM size if possible by reading the label. Check for notches, align RAM, reinstall the RAM. Using CPUz identify the amount of RAM within the college computers in T104. How many RAM slots are there on the motherboard? What is the current size of RAM memory inside the PC? (the motherboard manual will typically confirm the maximum size). Computer Components 18
19 Basic Input Output System Firmware located on the Motherboard that is loaded when the computer is first switched on. Identifies and checks the system hardware Carries out POST (Power On Self Test) Prepares a system to boot an Operating System. Many types exist, Phoenix, Award, Ami, etc. An example of a ROM (EEPROM) Computer Components 19
20 A replacement for the BIOS system, yet supports BIOS services. UEFI is a specification detailing an interface that helps to hand off control of the system for the pre-boot environment (i.e.: after the system is powered on, but before the operating system starts). Benefits include: Support for new standard such as ipv6 (ipv6 network boot - iscsi, PXE) Improve boot graphics (Safe Mode Video) New authenticated boot scenarios 32-bit protected mode as being a native mode of operation Support for > 2TB hard disk Computer Components 20
21 Specialised cards (generally PCI or PCI-e bus) Networking Sound Additional ports Considerations Bus type Free Space Device Driver (correct software) Computer Components 21
22 How to remove and install an expansion card? Blanking plates Screw or retain the card Ensure the card is found by the Operating System. Computer Components 22
23 which processor cache is quickest to fetch/store data L1 or L2? How much cache can be found on a typical AMD Quad core processor? Which other PC component also includes a cache? What memory type is the fastest -SRAM or SDRAM? Modern RAM is found in which format DIMM or SIMM or Rambus? Explain the term firmware. Computer Components 23
24 Introduce assignment Part 1 can now be completed. Computer Components 24
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