Magnetic Tape Care, Storage, and Error Recovery.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Schenck, Thomas
Format:	Recurso educativo Open Access
Language:	en
Published:	1984
Subjects:	Computer Storage Devices Information Storage Magnetic Tapes Preservation
Online Access:	Acceder al recurso
Tags:	Add Tag No Tags, Be the first to tag this record!

Image Formats for Preservation and Access. A Report of the Technology Assessment Advisory Committee to the Commission on Preservation and Access.
by: Lesk, Michael
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OCLC-MARC Tape Processing: A Functional Analysis.
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Write-Once Laser Disc Technology.
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Magnetic Tape Storage and Handling: A Guide for Libraries and Archives.
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OERI Directory of Computer Tapes. May 1987 and Supplement. September 1987.
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International Access to Bibliographic Data: MARC and MARC-Related Activities.
by: Hopkinson, Alan
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Canadian Experience with MARC.
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Retrospective Conversion at a Two-Year College.
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The MARC II Format: A Communications Format for Bibliographic Data.
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Business Information Audio Cassettes: Their Care and Feeding
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A Prototype System for a Computer-Based Statewide Film Library Network: A Model for Operation. Statewide Film Library Network: System-1 Specifications - Files.
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Experimental On Line Catalog for the Dartmouth College Libraries.
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The Invisible Drip...How Data Seeps Away in Various Ways.
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Beyond Migration: Preserving Electronic Documents with Digital Tablets.
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The Power of Imaging.
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The Distribution of Information: The Role for Online Public Access Catalogs.
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Specifications of a Mechanized Center for Information Services for a Public Library Reference Center. Final Report. Part 1, Preliminary Specification: Mechanized Information Services in Public Library Reference Centers.
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Mass Storage Technology and File Organization.
by: Malinconico, S. Michael
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Standards for Cataloging of Magnetic Tape Materials. Final Report on Mechanized Information Services in the University Library, Phase I - Planning. Part 4.
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National Aspects of Creating and Using MARC/RECON Records.
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A Bibliography on the Storage and Care of Non-Book Materials in Libraries with Selected Annotations.
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Copyright and Preservation: A Serious Problem in Need of a Thoughtful Solution.
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Before It's Too Late: A Digital Game Preservation White Paper
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Archiving Writers' Work in the Age of E-Mail
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The Use of OCLC in Academic Libraries in New York State. A Report of a Survey.
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Time Study of the Digitization of Images in a Microcomputer Environment.
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if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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