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HW2 - midterm 1

CST8190 - midterm 1

Advantages of SSD? Speed(5-10x), Reliability (no moving parts), Weight + Power
Disadvantage of SSD? Cost, Finite lifetime, Garbage collection
Types of NAND (Flash memory) Single-Level Cell (SLC), Multi-Level Cell (MLC). MLC used in consumer level.
How does SSD write data? Writes data in pages (smallest portion that can be addressed)
How does SSD delete data? Deletes data in blocks, made up of multiple (hundreds of pages). Voltage problems make it so must delete in blocks.
Garbage Collection Allows SSD to reuse stale pages. Pages storing data in a block with stale pages are copied to another block so that original block can be erased/reused.
Do drives know about file system? Most do not, they only manage where data is stored. OS tells drive to delete a file, SSD realizes that data is now stale.
TRIM Gives the SSD better information so garbage collection can work more efficiently.
Write Amplification multiplying effect of the amount of data a user has saved and how often it has been copied and moved.
Wear Leveling Attempt to write data as evenly as possible to extend the drive's full capacity and performance.
Troubleshooting Process step 1: Identify problem, symptoms
Troubleshooting Process step 2: Establish theory of cause, look for clues, determine one possible reason for current condition
Troubleshooting Process step 3: Test the Theory. Find out if what you think the solution is the actual solution?
Troubleshooting Process step 4: Establish an action plan and implement solution. Do what needs to be done to solve problem.
Troubleshooting Process step 5: Verify functionality.
Troubleshooting Process step 6: Document findings.
Rotational Speeds for Hard Drives 3.6k, 5.4k-7.2k, 10k, 15k
HD Sectors hold how many bytes? 512B or 4kB(Advanced Format)
Differential Backup Saves all changes since full backup in 1 media. At most 2 backup media required to restore data, faster than incremental for restore.
Incremental Backup Saves all changes since last backup (full/incremental). Faster backup, smaller media per incremental. To restore requires multiple backup media.
What is an integrated and dedicated servo? HD heats up, changes shape, head could be misaligned. Servo protects against, integrated goes through platter, dedicated sits on bottom.
Pins on memory: Laptop:(DDR1+2= 200, DDR3= 204), Desktop:DDR2/3=240, DDR1=184
MXM Mobile PCI Express Module, Graphics module in laptops, used for upgrade
Installing new wireless card into a new laptop what type? Mini PCI
Cause of screen flickering or very dark laptop monitor Inverter or CCFL
What parts of laptop better for technician to replace? CPU, motherboard, anything hard to get to.
Purpose of function key, what can it do? Activates secondary ability of a key. Brightness, volume, wireless, monitor select...
Components that can fit into a system but may not be compatible? RAM, CPU
Error messages when system files are missing ntldr loader is missing / booting to safe mode = change boot.ini
Coarse Screws used in: case, expansion slots, HD
Fine thread screws used in: optical+floppy
Virus types Worms, Rootkit, Boot Sector, Trojan, Malware, keylogger, phishing.
Firewall vs. Network intrusion software? Firewall = active, Network Intrusion = passive
Why uncheck hide known file extensions? masked programs (security)
When physically setting up a server what should you be concerned with? security, UPS, properly grounded, cooled
What happens when your CMOS battery dies or is cleared? date/time/hardware settings all get reset or if dead wont be remembered every reboot.
Why would you deliberately delete CMOS data? clear BIOS password
SATA uses master/slave? false
80 pin IDE cables/color uses Blue: motherboard, Grey: slave, Black: master
Main motherboard power connector name/pins? P1 / Main ATX - 24
Pins: SATA 15
Backwards floppy connector? light stays on all the time...also won't work
Tailgating? getting through a security door someone else opens
System files corrupt! What to do? Recovery console from windows DVD
Low level problems in a bricked system? take off non mandatory items?
Mandatory items to start a computer? CPU, power, video card, memory, motherboard
Power connector for a floppy drive? Berg (4 pin)
What can be done to limit hardware/software problem downtime? Backup systems, hot swaps, images, replacement hardware
What is software like deepfreeze used for? All changes made to computer are wiped on reset
Physical computer security? lock usb(ports), lock computer to desk, multifactor ID (fingerprint+password+whatevs)
Form factors of motherboards? At, Baby AT, ATX, Micro-ATX, Mini-ITX, NLX, BTX/Micro-BTX
137 gig limitation/solution? Old ATA protocol, 28 address bits to specify sectors. New 32 bit address can take 256 TB.
Created by: Datheral