厌氧
发表于 2025-3-21 17:21:33
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ANNUL
发表于 2025-3-21 22:42:57
Die Roste von Dampfkessel-Feuerungen,of the system are permanently stored on a relatively cheap, but slow, mass storage unit. When a record is requested for online use, a copy is made on a disk, and it is this copy that is used for as long as necessary. When the transaction is completed, the copy is returned to the mass storage device, replacing the old copy.
山崩
发表于 2025-3-22 03:14:00
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内部
发表于 2025-3-22 05:52:09
Book 1983d business data processing installations to maintain on line their program libraries, less frequently used data files, transaction logs and backup copies under unified system control. Tapes, disks and drums are classical examples of mass storage media. The more recent IBM 3851 Mass Storage Facility,
外露
发表于 2025-3-22 12:20:11
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声明
发表于 2025-3-22 13:09:15
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有花
发表于 2025-3-22 20:21:22
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Silent-Ischemia
发表于 2025-3-23 00:02:29
have been devised to position the records to decrease the average access time. The first two chapters of this book are devoted mainly to such algorithmic studies in linear and two-dimensional mass storage systems. In the third chapter, we view the bubble memory as more than a storage medium. In fact, we discu978-3-642-69354-0978-3-642-69352-6
Common-Migraine
发表于 2025-3-23 04:14:23
Two-Dimensional Storage, disks would be very expensive, while storing on tapes would mean very slow access time. In practice, a two-level storage system is used. All records of the system are permanently stored on a relatively cheap, but slow, mass storage unit. When a record is requested for online use, a copy is made on
SHOCK
发表于 2025-3-23 06:06:06
Magnetic Bubble Memory,ity, magnetic bubble memory is expected to replace a majority of applications where conventional devices (such as disks and tapes) are used. Of course it can be used to simulate magnetic disks, so that the change to the existing software as well as hardware would be minimal. Early design indeed refl