johan, Author at Open Preservation Foundation

Roll the tape – recovering ’90s data tapes in BitCurator

January 31 , 2019

When the KB web archive was launched in 2007, many sites from the "early" Dutch web had already gone offline. As a result, the time…

Crawling offline web content: the NL-menu case

July 11 , 2018

In a previous blog post I showed how we resurrected NL-menu, the first Dutch web index. It explains how we recovered the site's data from…

Resurrecting the first Dutch web index: NL-menu revisited

April 24 , 2018

NL-menu was the first Dutch web index. The site was originally founded by a consortium of SURFnet, Dutch universities and the KB. From the mid-nineties…

Update on Isolyzer: UDF, HFS+ and more!

July 12 , 2017

Earlier this year I blogged about Isolyzer, a tool designed to help the detection of broken ISO images. Today I released a shiny new beta…

Image and Rip Optical Media Like A Boss

June 19 , 2017

Over the last months we've been working on the development of a provisional workflow for preserving the content of optical media in our collection. The…

Policy-based assessment with VeraPDF – a first impression

June 1 , 2017

Some four years ago I wrote a blog post that demonstrated how Apache Preflight (the PDF/A validator tool that is part of Apache PDFBox) can…

Read more from the author

Roll the tape – recovering ’90s data tapes in BitCurator

Crawling offline web content: the NL-menu case

Resurrecting the first Dutch web index: NL-menu revisited

Update on Isolyzer: UDF, HFS+ and more!

Image and Rip Optical Media Like A Boss

Policy-based assessment with VeraPDF – a first impression

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