Saurav Kumar
asked on
Data transfer rate and Average access time
Find the data transfer rate and average access time for disk pack with following specification
1. Disk pack capacity=100 ms
2. Storage surface=18
3. No of track/surface=600
4. Drive speed=3000 rpm
5. Average seek time=25 ms
1. Disk pack capacity=100 ms
2. Storage surface=18
3. No of track/surface=600
4. Drive speed=3000 rpm
5. Average seek time=25 ms
3000 RPM isn't slow for a disk pack that has 18 data surfaces, it's a top-loader circa 1975. that 100ms should be 100MB, the total capacity of the 11 platter pack (except they were 200MB in reality).
The data transfer rate and average access time, especially for old tech like this, will be highly dependent on system load.
For example, some really old disks serialize or prioritize requests FIFO, so speeds can vary wildly depending on load.
You can use this command with Linux, or the equivalent in whatever OS is connected to this device...
If the device is connected to some sort of specific, single application, embedded controller, tough to guess + tough to test.
For example, some really old disks serialize or prioritize requests FIFO, so speeds can vary wildly depending on load.
You can use this command with Linux, or the equivalent in whatever OS is connected to this device...
alias ddspeed="cd ~ && dd if=/dev/zero bs=1024k of=tstfile count=4096 && rm -f tstfile"If the device is connected to some sort of specific, single application, embedded controller, tough to guess + tough to test.
Is this somebodies Homework?
Access time=Seek time+latency time
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What is the interface? 3,000 rpm is really slow..
what is the sector size and # of sectors per track