Understanding Memory Unit Sizes
Memory units measure digital information storage capacity. Common units include Kilobytes (KB), Megabytes (MB), Gigabytes (GB), Terabytes (TB), and Petabytes (PB). These units follow a hierarchical structure where each larger unit represents a significantly greater amount of data.
Memory Unit Hierarchy
The standard relationship between these units is based on powers of 1024:
- 1 Megabyte (MB) is approximately $10^6$ Bytes (1024 KB)
- 1 Gigabyte (GB) is approximately $10^9$ Bytes (1024 MB)
- 1 Terabyte (TB) is approximately $10^{12}$ Bytes (1024 GB)
- 1 Petabyte (PB) is approximately $10^{15}$ Bytes (1024 TB)
Comparing Given Options
Comparing the units provided in the question:
| Unit | Approximate Size (in Bytes) |
| Megabyte (MB) | $10^6$ |
| Gigabyte (GB) | $10^9$ |
| Terabyte (TB) | $10^{12}$ |
| Petabyte (PB) | $10^{15}$ |
Conclusion
From the comparison, Petabyte (PB) represents the largest amount of data storage among the given options (Megabyte, Gigabyte, Terabyte, and Petabyte).
Important Questions from Memory Hierarchy
A computer has a memory hierarchy consisting of two-level cache (L1 and L2) and a main memory. If the processor needs to access data from memory, it first looks into L1 cache. If the data is not found in L1 cache, it goes to L2 cache. If it fails to get the data from L2 cache, it goes to main memory, where the data is definitely available. Hit rates and access times of various memory units are shown in the figure. The average memory access time in nanoseconds (ns) is ________. (rounded off to two decimal places)
- Match List I with List II
List I List II A. Address Space I. Associative Mapping B. Memory Space II. Logical address C. Cache Memory III. physical address D. Segmented Program IV. Virtual address
Choose the correct answer from the options given below: Related to computers, what is 'Wetware'?
____ number of lines are required to select __________ memory locations.
- Which of the following is the correct sequence of largest to smallest unit of Memory access time?
A. Millisecond
B. Picosecond
C. Nanosecond
D. Microsecond
E. Second
Choose the correct answer from the options given below:
