Is it not true that different operating systems position disc locations on various tracks for a reason? What are the benefits in each scenario?
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- A student finishes a Ph.D. working on a problem that has aspects that are directly patentable and solve a major problem in the disk drive industry. His new job could be with Hitachi or Seagate, or some similar firm. He arrives at the new job and discovers that the work done as a student, which is in the patent process, will solve the problem at his new company. If he reveals what he knows to his new employer he will be an immediate hero, but will compromise the patent process at his original institution. This step could have important financial implications for the original institution in the form of royalties. What are the relevant ethical considerations in this dilemma? The answer could depend on missing information, such as the nature of the contract signed by the student with his institution, if any, and the nature of its intellectual property rules. This information may have an impact on what the correct ethical response is.Suppose you have a 100GB database housed on a disk array that supports a transfer rate of 60MBps and a tape drive that supports 200GB cartridges with a transfer rate of 80MBps. How long will it take to back up the database? What is the transfer time if 2:1 compression is possible?In Feynman's lecture he wondered "why cannot we write the entire 24 volumes of the Encyclopedia Brittanica on the head of a pin". For a modern hard disk drive the area of a single bit of information on the surface of the disk is roughly 10 x 40 nm² in area. In such a hard drive would the area required to store the data for 24 volumes of the Encyclopedia Brittanica be greater or less than the head of a pin? In Feynman's lecture he estimates the 24 million books as big as the Encyclopedia Brittanica has 10¹5 bits of information.
- Defects in computer hard-drives will usually render the entire computer worthless. For a particular model, the percent defective in the past has been 3%. If a sample size of 100 is taken, what would the 99.7% upper and lower control chart limit be?Some data structures only make use of the outside tracks of magnetic disks, while others completely ignore the inner tracks. The phrase "hot spots" is often used to refer to such arrangements. Why would you want to do that, exactly?This duty is assigned to the operating system, which is responsible for ensuring that the blocks of a recently opened file are written to disc in the correct sequence. Is there anything in particular about magnetic discs that contributes to the fact that this is such an important factor? Would the adoption of solid-state drives (SSDs) instead make a difference, or would it be irrelevant to the discussion? - What might possibly be causing this?
- Certain databases that utilise magnetic discs utilise only the peripheral tracks, leaving the interior tracks unused. This is called a "hot-spot" configuration. What are the specific benefits of doing so?A particular high-performance computer system has been functioning as an e-business server on the Web. This system supports $10,000 per hour in gross business volume. It has been estimated that the net profit per hour is $1,200. In other words, if the system goes down, the company will lose $1,200 every hour until repairs are made. Furthermore, any data on the damaged disk would be lost. Some of this data could be retrieved from the previous night’s backups, but the rest would be gone forever. Conceivably, a poorly timed disk crash could cost your company hundreds of thousands of dollars in immediate revenue loss, and untold thousands in permanent business loss. The fact that this system is not using any type of RAID is disturbing to you.Although your chief concern is data integrity and system availability, others in your group are obsessed with system performance. They feel that more revenue would be lost in the long run if the system slowed down after RAID is installed. They have…A particular high-performance computer system has been functioning as an e-business server on the Web. This system supports $10,000 per hour in gross business volume. It has been estimated that the net profit per hour is $1,200. In other words, if the system goes down, the company will lose $1,200 every hour until repairs are made. Furthermore, any data on the damaged disk would be lost. Some of this data could be retrieved from the previous night’s backups, but the rest would be gone forever. Conceivably, a poorly timed disk crash could cost your company hundreds of thousands of dollars in immediate revenue loss, and untold thousands in permanent business loss. The fact that this system is not using any type of RAID is disturbing to you.Although your chief concern is data integrity and system availability, others in your group are obsessed with system performance. They feel that more revenue would be lost in the long run if the system slowed down after RAID is installed. They have…
- Give me some more background on how holographic storage works.The internal tracks of a magnetic disc may go unused with certain databases, however this is seldom the case. The term "hot spots" is often used to describe this arrangement. What are some of the upsides of taking this kind of action?There are several databases that only use the external tracks of magnetic disks for the storing of data, hence the interior tracks of the disks are often left empty. The word "hotspot" is what's used to refer to this particular arrangement. When it comes to doing so, what are the specific perks that come along with it?