PPT-Disks

and RAID Outline Disks Disk scheduling algorithms Redundancy in storage systems RAID 2 Disk Geometry Disks have multiple platters Each platter has an arm and a head for accessing data The arms for the different platters move together. All Fujifilm floppy disk manufacturing plants worldwide have been awarded ISO9002 certification your assurance of stringent quality control at every step of the production process And Fujifilm floppy disks have been successfully tested beyond 30 mil RAID (Redundant Arrays of Independent Disks). Disk . organization technique that manages a large number of disks, providing a view of a single disk of. High capacity and high speed up using multiple disk in parallel. Phil Armitage. Colorado. Processes in Protoplanetary Disks. Disk structure. Disk evolution. Turbulence. Episodic accretion. Single particle evolution. Ice lines and persistent radial structure. Transient structures in disks. ASHIMA KALRA . . Hard disks.. . Floppy disks.. . CD ROMs.. . DVDs.. . INDEX. ….. Floppy Disks. The first floppy disks were 8 Inches in diameter.They hold upto 256 KB.. The next generation were 5.25 inches in diameter.It Could hold up to 1.44 MB.It is a standard one.. Ofir Weisse. EECS 582 – W16. 1. About the paper. Published in 1988. Summarized existing technologies. EECS 582 – W16. 2. Motivation – What’s In the Box? . (That we call a computer). EECS 582 – W16. . 6. /27/12. In collaboration with . Avi. Loeb. Harvard University Astronomy Department. arXiv:. 1109.6660, PRL 108, 6, 061302. Observing . Lense-Thirring. Precession in Tidal Disruption Flares. Outline. Pawel. . Artymowicz. U of Toronto. MRI turbulence. Some non-MRI turbulence. Roles and the dangers of turbulence. UCSC Santa Cruz 2010. I borrowed some . figures & slides from. X. Wu (2004). R. Nelson (2008). Reads and writes are equally fast.. Arrays of these disks are used to provide highly reliable storage.. Increasingly popular as they are fast and do not contain moving parts.. Magnetic Disks.. . What is a magnetic disk and how it works. Two main types: Magnetic and Optical. Random access to memory. The hardware must be controlled by driver software called the “controller” in order to be used. Hard Disks, RAID, and Error Handling. Use multiple smaller disks (c.f. one large disk). Parallelism improves performance. Plus extra disk(s) for redundant data storage. Provides fault tolerant storage system. Especially if failed disks can be “hot swapped”. mangrove forestsEcological Society, ournal of EcologyIntroductionDespite considerable research interest in the ecology ofmangrove forests, there is a surprising paucity of infor-mation concerning the DRAFT VERSIOK APRIL 7, 2011 J§.'IEX style emulateapj v. 6/22/04 SPITZER IRS SPECTROSCOPY OF THE 10 MYR-OLD EF CHA DEBRIS DISK: EVIDEXCE FOR PHYLLOSILICATE-RICH IN THE TERRESTRIAL ZOXE CSE 2431: Introduction to Operating Systems. Instructor: Adam C. Champion, Ph.D.. Reading: Chap. 11. , §§13.5, 14.5.6 . [OSC]. Outline. Disk Organization. Disk Performance. Disk Scheduling Algorithms. Don Porter. Portions courtesy Emmett . Witchel. 1. Quick Recap. CPU Scheduling. Balance competing concerns with heuristics. What were some goals?. No perfect solution. Today: Block device scheduling.