11 INTRODUCT ION The magnetic hard disk drive (HDD) plays an important and extremely useful role in every information processing system; in fact this role is constantly growing as a result of advances in capacity, performance and price. Since the first HDD was introduced in 1956, this device has been the recipient of significant additional technology innovations which have extended its value. I...

OBJECTIVES Hospital discharge data (HDD) in many health systems do not capture the date of injury (DOI); the absence of this date hinders researchers' ability to distinguish repeat from incident injury admissions. Various approaches using somewhat arbitrary criteria have been explored to increase the accuracy of incident injury identification. However, these approaches have not been validated a...

We propose a new type of heterogeneous storage device called Combo Drive, which comprises of a smaller-capacity low-latency solid-state disk drive (SSD) concatenated with a larger-capacity high-throughput hard disk drive (HDD). The overall cost of a Combo Drive, similar to a Hybrid Drive, is still dominated by the more capacious HDD. With Combo Drive, the performance advantages of both the SSD ...

The increasing volume of time-based generated data and the shift in storage technologies suggest that we might need to reconsider indexing. Several workloads like social and service monitoring often include attributes with implicit clustering because of their time-dependent nature. In addition, solid state disks (SSD) (using flash or other low-level technologies) emerge as viable competitors of...

We consider in this paper the design and implementation of a dual-stage actuated hard disk drive (HDD) servo system, in which an additional piezoelectric actuator is mounted on top of the conventional voice-coil-motor (VCM) actuator to provide a faster and finer response. More specifically, the dual-stage actuated HDD servo system consists of a primary VCM actuator and a secondary suspension pi...

Climate change is expected to influence cooling and heating energy demand of residential buildings affect overall thermal comfort. Towards this end, the (HDD) (CDD) degree-days along with HDD + CDD were computed from an ensemble seven high-resolution bias-corrected simulations attained EURO-CORDEX under two Representative Concentration Pathways (RCP4.5 RCP8.5). These three indicators analyzed f...

Over the last few years, the proliferation of solid state disk (SSD) based IO solutions triggered an entire benchmarking frenzy, comparing the throughput potential of SSD and hard disk drive (HDD) components, respectively. In most of these performance studies, little is known about the actual HW, OS, and SW setup, benchmark environment, benchmark tool, validation techniques used to asses the be...

We present Griffin, a hybrid storage device that uses a hard disk drive (HDD) as a write cache for a Solid State Device (SSD). Griffin is motivated by two observations: First, HDDs can match the sequential write bandwidth of mid-range SSDs. Second, both server and desktop workloads contain a significant fraction of block overwrites. By maintaining a log-structured HDD cache and migrating cached...

In this work, we introduce some novel heuristics which can enhance the efficiency of the Heuristic Discord Discovery (HDD) algorithm proposed by Keogh et al. for finding most unusual time series subsequences, called time series discords. Our new heuristics consist of a new discord measure function which helps to set up a range of alternative good orderings for the outer loop in the HDD algorith...