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Intelligent Edge
Published in Haishi Bai, Zen of Cloud, 2019
Warm storage. For storage on disk, Solid State Drives (SSDs) can be used to provide better performance over traditional Hard Disk Drives (HDDs). SSDs don't have any mechanical parts, so they can seek disk addresses much more efficiently than HDDs that use mechanical actuators over rotating disks. Most databases are backed by hard drives. Data stored in warm storage is used for batched analysis such as aggregations, cross-references, and trend analysis.
Data Management of Light Detection and Ranging
Published in Jie Shan, Charles K. Toth, Topographic Laser Ranging and Scanning, 2018
In general, online and near-online data storage arrangements are much less labor intensive to maintain than offline systems. Of course, the tradeoff is that the hardware required to realize these mechanisms are more expensive than offline storage. It is very important to realize that data redundancy within a single unit such as archiving to an online RAID 5 system is not sufficient protection. If the disk hardware suffers a catastrophic failure such as a lightning strike or physical damage (fall, flood, fire, etc.), then all is lost. Thus, you must maintain a duplicate system at a separate physical location. Large sample size analysis from the Carnegie Mellon Parallel Data Laboratory (Schroeder and Gibson, 2007) seems to indicate that the practical life of hard disk drives is about 5 years. As this represents nearly three generations of hard disk technology, it might be a reasonable plan to completely replace online hard disk technology on a five-year cycle.
Spindle Motor Control
Published in Abdullah Al Mamun, GuoXiao Guo, Chao Bi, Hard Disk Drive, 2017
Abdullah Al Mamun, GuoXiao Guo, Chao Bi
Leakage magnetic field must be low. HDD utilizes the magnetic field to read/write data onto the media. Hence, the process of data access is very sensitive to external magnetic field, which includes the leakage magnetic field from the spindle motor. This issue will be especially crucial when the industry will adopt perpendicular recording technology.
Analysis of the dynamical behaviour of spinning annular disks with various boundary conditions
Published in Mechanics Based Design of Structures and Machines, 2023
Hilal Koç, Ömer Ekim Genel, Mertol Tüfekci, Ekrem Tüfekci
As experimental validation, the rotating disk of the Seagate Barracuda ST2000DM001 hard disk driver is analyzed. The outer and inner diameters of the disk are 95 mm and 32.5 mm, respectively and the thickness is 1.3 mm. Although the standard operating speed of the concerned HDD is 7200 rpm, using an electronic speed controller, variable rotational speed values can be obtained. In here, the disk is rotated at 0-2500-5000-7500 rpms. The speed of the disk is controlled via an accelerometer which is glued onto the casing. Due to the rotating nature of the structure, the vibration response is obtained using Polytec CLV- 2534 Compact Laser Doppler Vibrometer.
iSDS: a self-configurable software-defined storage system for enterprise
Published in Enterprise Information Systems, 2018
Wen-Shyen Eric Chen, Chun-Fang Huang, Ming-Jen Huang
In a modern storage system, there are two types of storage media. HDD uses magnetic media to store digital data. SSD uses integrated circuit to store digital data. HDD has much slower speed than SSD but has the advantage of lower price per unit and higher areal density than SSD. Therefore, SSD is usually used as a cache of HDD to increase the read/write performance for a workload. Due to its high price, SSD is a precious storage option for trading higher performance.