1. What is the maximum capacity for DDR3/DDR4 RAM?
What is the difference between SDR and DDR?
Which of the triplets is SRAM?
What is stored by primary storage components?
What happened when the industry changed from SIMM to DIMM technology?

2. Secondary Storage
Backups & Crashes

3. Intro Bits & Bytes Types Magnetic Optical Paper Read & Write
Rapid degradation
Optical
Read…maybe write
Slow degradation
Paper

4. Bits & Bytes 1 Bit – 0 or 1 8-bits – 1 character – 1 Byte
Kilobyte – 1000 bytes
TRS-80 – 4K RAM (1977)
Megabyte – 1,000,000 bytes
30 phonebook pages
1987 Desktop
Gigabyte – 1,000,000,000
One movie
1997 Desktop
Terabyte – 1,000,000,000,000
5,500 copies of every phonebook in the world
2013 Desktop
Petabyte, etc
Not in use other than stacked TB storage

5. Magnetic
HDD
PATA (IDE)
SATA
SCSI
SSD
Hybrid

6. Magnetic

7. Magnetic
FDD 8”
5.25”
3.5”

8. Optical CD
WORM
R/W
DVD
Blu-Ray

9. Price/Performance Modern Memory Hierarchy
CPU Chip
Core Registers
Cache
• access time: ns
• cost: ~$5000 per GB
Level 1 Cache
Level 2 Cache
Level 3 Cache
DRAM
DRAM Memory
• access time: 50-70ns
• cost: ~$20-75 per GB
USB
Flash Memory
• access time: ns
• cost: ~$4-12 per GB
Mechanical
Disk
Magnetic Disk
• access time: 5-20ms
• cost: ~$ per GB
Tape

10. History 1928 – Mag Tape 1956 – Hard Disk 1966 – DRAM
1970 – Bubble Memory
1976 – 5.25 FDD
1981 – 3.5 FDD
1984 – CD ROM

11. History 1994 – Flash Memory 1995 – DVD 1995 – CD-RW 1999 – Microdrive
2003 – Blu-Ray
2004 – Cloud
2009 – SSD
2010 – Hybrid
????