How to find the amount of inter record gap in a magnatic tape?

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Discussion Overview

The discussion revolves around calculating the largest inter-record gap (IRG) that allows 80 percent of a 2400-foot magnetic tape to be used for data, given specific parameters such as recording density, data record size, and memory buffer. The context includes a tutorial question that lacks sufficient guidance for the participants.

Discussion Character

  • Homework-related, Mathematical reasoning, Technical explanation

Main Points Raised

  • One participant seeks help with a tutorial question involving the calculation of the largest IRG for magnetic tape, providing specific parameters including tape length and recording density.
  • Another participant questions the context provided in the tutorial and suggests that there should be additional information to assist in solving the problem.
  • A different participant proposes that the problem appears to be a straightforward mathematical calculation based on the given data density and tape length, encouraging the original poster to show their work.
  • Another viewpoint suggests that the IRG traditionally has a fixed size in real magnetic tape formats, indicating a difference in how data records and gaps are typically managed.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the problem, with some agreeing that it is a mathematical issue while others highlight the complexity of the context and the need for additional information. No consensus on the approach or solution exists.

Contextual Notes

The discussion reveals limitations in the information provided by the tutorial, including potential missing assumptions and the need for clarification on definitions such as Bpi (Bytes per inch).

Who May Find This Useful

Students or individuals interested in magnetic tape technology, data storage calculations, or those seeking help with similar mathematical problems in a tutorial context.

seini
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hello i have a question given to me on a tutorial which is to find what is the largest IRG that will allow 80 percent of the tape to be data in 2400 foot magnetic tape has recording density 6400 Bpi and data records are 100 bytes and memory buffer is 10,000. i have been looking every where but i did not find any luck ...can someone help me with this question please
 
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seini said:
hello i have a question given to me on a tutorial which is to find what is the largest IRG that will allow 80 percent of the tape to be data in 2400 foot magnetic tape has recording density 6400 Bpi and data records are 100 bytes and memory buffer is 10,000. i have been looking every where but i did not find any luck ...can someone help me with this question please

Welcome to the PF.

What kind of information does the tutorial give you before asking this question? There must be some context and useful information in the tutorial to help you answer this question, right?
 
well it suppose to be a tutorial but our lecturer said to go and do some research on it and the information that was given is the one i post it and our text did cover magnetic tape and i have been searching in the internet for it but it seem it does not really give me information on how to find it...
 
seini said:
well it suppose to be a tutorial but our lecturer said to go and do some research on it and the information that was given is the one i post it and our text did cover magnetic tape and i have been searching in the internet for it but it seem it does not really give me information on how to find it...

I could be missing something, but it looks to be just a straight math problem. You are given the data density in Bytes per inch (is that what Bpi stands for?), and you are given the amount of data and the length of the tape. You want the data to end up being 80% of the tape, so how big can the gaps be?

Try just working it as a math problem using the numbers you are given. Show us your work, so we can see if it seems you are on the right path.
 
berkeman said:
I could be missing something, but it looks to be just a straight math problem.

I think that's right, because this is back-to-front compared with how the format of real mag tape used to work. The inter-record gap was a fixed size, long enough (usually a few mm) to allow the tape to stop and start between records. The thing you could change was the data record (block) length, not the gap length.
 

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