I found an old post made about keepered media several years ago concerning an Oct '96 article in "Data Storage" on keepered media:
"A couple of important benefits of using keepered media were addressed in the article. One was that as densities approach 10 GB per square inch, the data might become unstable over time. The keepered layer could reduce this demagetization making a more stable high-density storage system. Another point was that Ampex has been working with uncoated media supplied by outside vendors, then applying the keepered layer and testing the media. Apparently, the keepered system hasn't been optimized, and none of the keepered media tested were manufactured using a continuous disk deposition process. They then described several ways in which the system could be optimized, including using a thinner medium, optimizing proximity keepered media, and designing a keepered media to achieve gains with MR heads. I thought it was important when they said that keepered media could allow higher flying heights while increasing capacity, thereby reducing the durability concerns normally associated with low-flying or contact heads. As you lower the flying height of the head assembly, you increase the probability of crashing the hard drive. You also need a much stiffer head assembly."
Keepered media is definitely a benefit in these dirty applications, charge card readers, ATM's, etc. |
