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Main Author:	Van Bogart, John W. C.
Format:	Recurso educativo Open Access
Language:	en
Published:	1995
Subjects:	Audiotape Cassettes Costs Equipment Maintenance Equipment Standards Equipment Storage Guides Library Facilities Magnetic Tapes Preservation Problems Repair Videotape Cassettes
Online Access:	https://eric.ed.gov/?id=ED384356
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_version_	1867181710204993536
author	Van Bogart, John W. C.
author_facet	Van Bogart, John W. C. Van Bogart, John W. C.
collection	Education Resources Information Center
contents	Magnetic Tape Storage and Handling: A Guide for Libraries and Archives. Van Bogart, John W. C. Audiotape Cassettes Costs Equipment Maintenance Equipment Standards Equipment Storage Guides Library Facilities Magnetic Tapes Preservation Problems Repair Videotape Cassettes This document provides a guide on how to properly store and care for magnetic media to maximize their life expectancies. An introduction compares magnetic media to paper and film and outlines the scope of the report. The second section discusses things that can go wrong with magnetic media. Binder degradation, magnetic particle instabilities, substrate deformation, magnetic tape recorders; and format issues are highlighted in this section. The third and fourth sections cover preventing information loss with multiple tape copies, costs, and how long magnetic media will last. In the fifth section, care and handling, storage conditions and standards, and refreshing of tapes are described for preventing magnetic tape from degrading prematurely. An appendix provides the Ampex Guide to the Care and Handling of Magnetic Tape, an estimation of life expectancies, sources for further reading, resources for transfer and restoration of video and audio tape, and a glossary. (AEF)
format	Recurso educativo Open Access
id	eric_ED384356
institution	ERIC Institute of Education Sciences
language	en
publishDate	1995
record_format	eric
spellingShingle	Magnetic Tape Storage and Handling: A Guide for Libraries and Archives. Van Bogart, John W. C. Audiotape Cassettes Costs Equipment Maintenance Equipment Standards Equipment Storage Guides Library Facilities Magnetic Tapes Preservation Problems Repair Videotape Cassettes Magnetic Tape Storage and Handling: A Guide for Libraries and Archives. Van Bogart, John W. C. Audiotape Cassettes Costs Equipment Maintenance Equipment Standards Equipment Storage Guides Library Facilities Magnetic Tapes Preservation Problems Repair Videotape Cassettes This document provides a guide on how to properly store and care for magnetic media to maximize their life expectancies. An introduction compares magnetic media to paper and film and outlines the scope of the report. The second section discusses things that can go wrong with magnetic media. Binder degradation, magnetic particle instabilities, substrate deformation, magnetic tape recorders; and format issues are highlighted in this section. The third and fourth sections cover preventing information loss with multiple tape copies, costs, and how long magnetic media will last. In the fifth section, care and handling, storage conditions and standards, and refreshing of tapes are described for preventing magnetic tape from degrading prematurely. An appendix provides the Ampex Guide to the Care and Handling of Magnetic Tape, an estimation of life expectancies, sources for further reading, resources for transfer and restoration of video and audio tape, and a glossary. (AEF)
title	Magnetic Tape Storage and Handling: A Guide for Libraries and Archives.
topic	Audiotape Cassettes Costs Equipment Maintenance Equipment Standards Equipment Storage Guides Library Facilities Magnetic Tapes Preservation Problems Repair Videotape Cassettes
url	https://eric.ed.gov/?id=ED384356

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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Environment & details:

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VUFIND_LOCAL_DIR	"/usr/local/vufind/local"
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Environment Variables empty

Registered Handlers

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