Mass storage, devices

Mass storage device. Typically, fixed-head hard disk drives are used to store ac tive data, including on-line and historical databases and non-memory-resident programs. Memory-resident programs are stored to allow loading at system startups. The tape drives are used for archives and backups. 

Methods of Data Acquisition. Any of three methods of data acquisition may be selected. The first method is the single spectrum acquisition. The mass storage devices will be zeroed and a hardware stopwatch is started. 

DMA (direct memory access) A method of transferring information directly from a mass-storage device such as a hard disk or from an adapter card into memory (or vice versa), without the information passing through the processor. 

Heumann, K., Mewes, H.-W. (1996) The Hashed Position Tree (HPT) a sufGx tree variant for large data sets stored on slow mass storage devices. In Proceedings of the 3rd South American Workshop on String Processing, Carleton University Press, Ottawa 101-114. 

Magnetic tapes These are low-speed mass storage devices with significant capacity (10 to 20 million words). They are seldomly found on process control computers and they are used to store off-line large programs and large amounts of data. 

Mass storage devices are used to store large amounts of data and/or instructions. Various types of mass storage devices are available with different (1) capacities for storage, (2) purchase costs, and (3) speeds for accessing and retrieving information. The most common units are ... 

The current practice is to rely on minicomputers with more efficient programs and faster mass storage devices to speed up the data handling and processing. (There is not much we can do about data acquisition.) Since, if the 2-D experiment is performed in any detail, the computation (and plotting) time could take many hours even with a modern minicomputer, we should rethink about how the experiments should be performed. Basically, we are back to the pre-FFT situation when it was unthinkable to do an on-line FT experiment. We believe that it makes much sense to process 2-D NMR data offline on large computers designed for ultra fast computations and let the minicomputer concentrate on data acquisition. 

The interpretation of spectroscopic data for the identification and structure elucidation of organic compounds is largely an empirical process and relies heavily on the use of previously accumulated reference data. Compilation of computer-readable spectroscopic data bases is nowadays feasible because most commercially available spectrometers have small built-in computers for the digital acquisition of measured spectroscopic data they are also equipped with a suitable mass storage device to store spectra or selected spectral data, or they provide the facility to transfer the recorded spectra to a more powerful external computer. If the computer-readable spectroscopic data are suitably organized, the analyst is provided with a very powerful tool for the identification of a compound, a group of compounds or a structure by means of suitable software, thereby avoiding the slow and tedious manual work otherwise involved [67,69]. 

The two operating systems interface with the Octopus network environment to provide parallel services for applications programs. This compatibility is reflected in the use of the general term, Livermore Time Sharing System (LTSS), to encompass both systems. FROST and FLOE interface with the Octopus network to provide interactive and file transfer support for the over 700 on-site terminals and the LLL mass storage devices. Each operating system occupies about twenty percent of the resident worker computer s core memory with approximately three-fifths of this space allotted to system tables. 

Aramica. In both cases the product goal was a high strength, thin film for mass storage devices. Film properties are shown in Table 13.5. 

The five-point measurement used here (Fig. 38) is not so often employed today. Large mass storage devices make it possible to store all the measured points for a reflection... 

Access to all sites of the OPCW and key components of the IMS, such as the servers and mass storage devices, must be controlled. All hardware in the confidential part of the IMS and especially workstations, servers and user terminals shall be protected, not only from theft or criminal damage, but also from unauthorised physical access and tampering attempts. In addition, maintenance and repair activities on IMS hardware shall be supervised and recorded. Access to such hardware items as servers, printers, back-up devices, as well as other output devices, shall be limited to staff members with appropriate clearances. 

---