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From Bjoern Hassler
Welcome to Björn Haßler's website! My site about ICT, education, open access, media, and science. My work is about using ICT in education, and spans primary to higher education, both in European and African contexts.
You can contact me by email: bjoern (followed by AT sign) sciencemedianetwork (then a DOT) org
Note that some content is hosted on my wiki, and those links are marked with a little globe like this:.
Bjoern Hassler's most recent posts on Twitter:
- bjoernhassler: http://t.co/c7xXfivQ Raspberry Pi faces challenge from Android-based rivals (Wednesday 23rd of May 2012 02:38:43 PM)
- bjoernhassler: Moog - very cool! http://t.co/WGnHgTKu (Wednesday 23rd of May 2012 11:34:30 AM)
- bjoernhassler: RT @deftoer3: Buddying up with @ORBITSTEM aka evaluation can be quite fun http://t.co/90VSJ0pp #ukoer (Tuesday 22nd of May 2012 02:13:03 PM)
- bjoernhassler: We have a Teaching Associate post available, see http://t.co/14OfT8O8. Please circulate this as widely as possible! #ukoer #ORBITSTEM (Thursday 17th of May 2012 04:59:06 PM)
- bjoernhassler: The #deft workshop is about drawing rather than about using the ipad app. That's how we see the use of ict: supportive rather than goal. (Wednesday 16th of May 2012 05:06:22 PM)
- bjoernhassler: Participating in #ukoer #deft workshop on using "brushes" app on ipad together with local teachers! (Wednesday 16th of May 2012 04:42:53 PM)
- bjoernhassler: DeFT and ORBIT joint meeting in Sheffield today. Good discussion! We agree that teachers are very enthusiastic to share! #ukoer (Wednesday 16th of May 2012 02:17:26 PM)
- bjoernhassler: RT @dkernohan: The awesome @ORBITSTEM folks are using a Kanban project management methodology. Any other kanbanfans in #ukoer ? (Friday 11th of May 2012 09:18:00 PM)
- bjoernhassler: @TheYamahaHub Thanks. I have a spec if it helps… (Friday 11th of May 2012 09:16:48 PM)
- bjoernhassler: The #eigenharp is really a feat of engineering! http://t.co/CVu8iYB3 (Friday 11th of May 2012 09:15:37 PM)
For more (or to follow), see http://twitter.com/bjoernhassler You can subscribe to the rss feed http://twitter.com/statuses/user_timeline/34270899.rss
Most recent blog entry: Blog/20120503 OS X volumes - hdiutil detach vs. Finder detach
A bit of a technical blog post, on something that was tricky to diagnose. It applies to OS X, version 10.7.3.
It seems that when a (newly created?) sparseimage is detached using
hdiutil detach
that some timestamps (of files in the sparseimage) change. I.e. if you check a timestamp, then use "hdiutil detach" and then reattach the image, then the timetamp is different (and has current time). So something seems to happen when "hdiutil detach" goes to work. "hdiutil" seems to "touch" some of the file, which changes the timestamp to current time.
However, if you eject the sparseimage via Finder, this doesn't seem to happen.
It's annoying.
A work-around is to use Applescript (e.g. with osascript) to eject the sparseimage in that way. That seems to work.
EDIT. So there also seems to be an issue with cp/ditto/rsync preserving file stamps when copying. That's how I'd originally noticed that something was wrong, but then during testing had also discovered the above problem. It seems to potentially affect large files, potentially some types of files. What's going on? (This is when copying between different volumes on the commandline. Copying via Finder seems to be ok.)