Average is half that, or
8.3 ms
. Transfer time: 512 / 3.5 MB/s = 146 μs — however, it will take a little longer to actually read the sector, since there are 64 sectors on the disk, and the disk rotates once every 16.7 ms, each sector will take 16.7 ms / 64 = 260 μs to read.
How long does it take on average to rotate to a random disk sector?
Thus, on average, the rotational latency is half the time it takes the disk to make a complete revolution. The disk spins at 10000 RPM, so it takes
1/10000 of a minute
to make one revolution. Equivalently, (1000 ms/sec × 60 sec/minute) / 10000 RPM = 6 ms to make one revolution.
How long does it take to read 100 sectors?
Answer: 100 pages will take
about 2.8 hours
to read for the average reader.
What is the average time to access and read a block of disk?
The typical range of average seek time is
10 to 60 msec
. This is the main culprit for the delay involved in transferring blocks between disk and memory.
What is the average time to read or write a 512 byte sector?
What is the average time to read or write a 512-byte sector for a typical disk rotating at 10,000 RPM? The advertised average seek time is
6 ms
, the transfer rate is 50 MB/sec, and the controller overhead is 0.2 ms.
How fast is fast reading?
Generally speaking, if you want to memorize something, you'll need to read slowly, at less than 100 wpm. A normal rate for learning is 100-200 wpm, and for comprehension it is 200-400 wpm. Speed reading is normally done at a rate of
around 400-700 wpm
.
Can you read 100 pages in a day?
That there just isn'
t enough time
in the day to develop a reading habit. … Instead, of decrying that you don't have enough time, you should ask yourself how much of that time is dead time and could be better spent. Reading 100 pages each day seems like a lot, but it's not as difficult as you might think.
Is the time taken by the arm to move to the required track?
The time taken to move the disk arm to the desired cylinder is called the :
positioning time or random access time
.
What is the average seek time?
The
mean time it takes to move the head of a disk drive from one track to another
, averaged over the source and destination cylinders. Usually measured in milliseconds (ms).
What is the maximum rotational latency?
| Rotational Latency Time Transfer Time | Maximum latency = 60/rpm Average latency = 0.5*Latency Time It takes about 1 sec to transfer 30-60MB of data |
|---|
How long does a disk read take?
Average is half that, or
8.3 ms
. Transfer time: 512 / 3.5 MB/s = 146 μs — however, it will take a little longer to actually read the sector, since there are 64 sectors on the disk, and the disk rotates once every 16.7 ms, each sector will take 16.7 ms / 64 = 260 μs to read.
How do I know my hard drive transfer rate?
Calculate the transfer speed by dividing the amount of data by the transfer time. Plug the amount of data (A) and transfer time (T) to solve for the rate, or speed (S), into the equation
S = A ÷ T
. For example, you might have transferred 25 MB in 2 minutes.
What is the most effective way to measure the average access time of a hard disk?
Disk access times are measured in
milliseconds (thousandths of a second)
, often abbreviated as ms. Fast hard disk drivesfor personal computers boast access times of about 9 to 15 milliseconds. Note that this is about 200 times slower than average DRAM.
What is the number of bits required to address a sector?
So the number of bits required to access a sector is
19
.
What is the rotational latency of a disk rotating at 5000rpm?
Latency is the time needed for the disk to rotate so the sector we want is under the read/write head. Hard disks usually rotate at about 5000rpm, which is
one revolution per 12 msec
. Transfer time is the time for the read/write head to pass over a block. transfer one sector would be 1/63 of a revolution.
How fast can Bill Gates read?
Take Bill Gates. He reads fast. Really fast. At
150 pages per hour
(750 words per minute), 15 books in a week and with a 90% retention rate, according to a Netflix documentary.
