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Rescuing photos from a crashed iMac

Using advanced tools to read files from a faulty disk

Oct. 15, 2020
This week I attempted to recover two decades of personal photo history from a crashed iMac.

This week I received a message from someone with a iMac that crashed. It contained more than 50.000 photos, covering two decades of personal history. As there was no backup, it was up to me to attempt to safe as much as I could. Could I possibly recover the personal photos?

Free from the iCloud: Escaping Apple Photos

Using offline photo library management software

Aug. 31, 2020
Recently I freed myself from Apple Photos, using free software to manage my photo library. Read along to find out what software I use and how to make it play nice with your devices.

After encountering the umpteenth ‘magic’ bug while managing my iPhone’s photos, I was done with it. Apple came a long way since it launched iPhoto (the predecessor of iCloud Photos). But for something as valuable as my personal memories, I want to be in full control. Read along to learn how I migrated my photo library away from the iCloud, using free, open source software.

The best keyboard for iPad

Smart Keyboard Folio vs Magic Keyboard

Aug. 11, 2020
While everybody is raving about the Magic Keyboard there is something to be said for the

The tablet is at the frontier of mobile computing and its hardware form factor is evolving. This year Apple introduced a new Magic Keyboard for iPad that includes a trackpad. Everybody is raving about it, yet I think there is something to be said for the "mouse-less" Smart Keyboard Folio. Read along for some key differences.

Upgrading a 27-inch iMac 5K to 14 terabytes

Replacing the Fusion Drive with both a SSD and an harddisk

July 30, 2020
This month I nearly destroyed my iMac during an attempt to upgrade it. Thanks to determination and some spare time I was able to resurrect it from the death!

This month I did an attempt to upgrade my 27-inch iMac 5K. I wanted to replace the fusion drive with a SSD and a large hardisk. In addition I decided this was a good time to upgrade the RAM memory as well, maxing it out at 64GB. I was on a mission to create the ultimate iMac, but things didn't go to plan!

Your own addressbook and calendar cloud

Share contacts, agendas and tasks with CardDAV/CalDAV

Feb. 28, 2020
You can setup a CardDAV/CalDAV server to manage your own contacts, addressbook, agenda and task data and share it between your devices.

If you use different devices and computers to get things done, you might want to synchronise contacts, agendas and tasks. You can use any of the 'big cloud' services for this, like Apple iCloud, Microsoft Office 365 and Google Gmail. But, if you prefer not to share your addressbook and calendar with big American companies, you can do it yourself.

Multi-Window support in your iPad app

Native development for iPadOS

Oct. 7, 2019
Take advantage of the improved support for multiple windows on iPadOS by implementing new UI concepts enabling different use cases for your app.

Last month Apple released iPadOS, the first dedicated operating system for iPad. It differs from iOS with its support for the larger iPad screen, including multi / split screen windows. I develop apps and it was time to take advantage of these new possibilities that iPadOS offers.

Limitations of sleep tracking using a wearable

Comparison with a chest strap HR-monitor

July 16, 2019
Limitations of heart rate analyses during sleep, why you should reconsider tracking your sleep.

Sleep monitoring is a popular feature of many smartwatches and wearables. Devices like Fitbit, Withings, Apple Watch and Biostrap analyse biometrics during your sleep. These wearables are worn on the wrist and use optical sensors to capture your heart rate. I wondered how the optical sensors would compare to a high resolution chest strap HR-monitor.

Optical vs chest strap heart rate monitors

Measuring beats per minute using different sensors

July 15, 2019
Understanding the differences in common HR monitors used in wearables, smartwatches and fitness trackers

With modern wearables, smartwatches and fitness bands, it has become easy and common to measure your heart rate. There are however fundamental differences in sensor types. Some sensors capture the electrical signal from your heart while others use light to analyse the blood flowing through your vessels. If you're interested in measuring heart rate, it's good to understand these differences.

The best bike computer app: Cyclemeter

Get advanced ride data with a flexible setup

Apr. 30, 2019
Collect advanced bike ride data using your smartphone connected to external Bluetooth sensors and a steer mounted display.

This month I have intensified my training to become fit for this year's Fietselfstedentocht, a 235KM bicycle ride through Friesland. Over the years I have tested different kinds of bike computer setups: from dedicated (and expensive) Garmin Edge bike computers to no data at all. Eventually I came up with a flexible setup to gather advanced ride data using my smartphone, let me explain how this works.

Business in a bag

Using a waterproof backpack to fit my gear

Dec. 22, 2018
After much testing I have selected a bag and set of cases to fit my entire business, wherever I go.

Over the past few months I have been testing different bags and cases to fit everything I need to run my business. As I commute by bike, the bag needs to be waterproof. The problem with waterproof gear is that it is usually very bulky. I need my gear to be both portable and representative, a challenge worth a blog post!

Is the Apple Watch the modern tool watch?

Testing the Apple Watch's usefulness in real life

Nov. 2, 2018
I tested the Apple Watch during my work in Frankfurt this week where I had to go inside an internet data centre.

This week I went to Frankfurt for business. I had to perform maintenance to servers in a data centre. This seemed like a great opportunity to test the Apple Watch's usefulness in real life (other than health and fitness). I wondered, is the Apple Watch the modern tool watch?

Using a budget Android as main smartphone

Comparing a Nokia (€99) with an iPhone (€1329)

Oct. 9, 2018
I switched to Android to find out how good a budget smartphone performs compared to an expensive iPhone.

Every now and then, I switch phones to keep track of mobile developments. As professional app and web developer, I need to know how different devices work in real life. This time I used a budget Android smartphone, making me curious how it would compare to an expensive iPhone.

Swimming and cycling with Apple Watch

Different activities in the workout app in watchOS

Sep. 27, 2018
This month I tested the newest watchOS while swimming and cycling.

This month Apple launched a new Apple Watch series and released an update to watchOS. The focus of the smartwatch is more and more gearing towards health and fitness. This made me curious, how well does Apple Watch work for different activities?

Tablet as main computer

Comparing the Microsoft Surface Pro to iPad Pro

Mar. 7, 2018
I have been using a tablet as my main computer for quite some time now. In this blog post I share you my experience on using Surface Pro and iPad Pro to get my work done.

For the past few weeks I have been using the Microsoft Surface Pro as my main computer. It's a modern tablet computer that can be used as laptop with the type cover. With the Surface Pen, it's a versatile PC that works in a lot of different ways. Time to find out if it's any good and how it compares to my other tablet computer, iPad Pro.

Something the smartwatch will never have: patina

Wear and tear by the hands of time

Jan. 21, 2018
Patina is often neglected when comparing smartwatches with regular watches.

A good friend of mine had an issue with his Apple Watch, the digital crown lost a rubber ring causing the watch to lose its water resistance. Apple made no problem of it and offered to replace his "device". While it solved his problem, it felt painful to my watch lover's ears. It made me realise the one thing a smartwatch will never have: patina.

Saving a MacBook Air with exploded battery

Don’t try this at home - but I did

Sep. 14, 2017
Saving a MacBook Air with a swollen battery pack.

Last night I had a nasty surprise: my original MacBook Air was swollen due to an exploded battery. I immediately had to take action, for reasons of safety and to preserve this piece of modern computer history. Don’t try this at home, but if you do... read along for some practical tips.

The day I killed my LAN

Turned off my local network and went 4G only

July 31, 2017
I killed my office LAN and went 4G only. Saves a lot of clutter, energy and money.

Today I called my provider to quit my office's ADSL internet subscription, I don't need it anymore. I have turned off my local area network and switched my workflow onto mobile internet only. The simplicity and savings actually surprised me so much, that I made blog post for it.

Smartwatches vs Mechanical watches

Why I still wear mechanical and why smartwatches have potential

Apr. 30, 2017
Why I still wear a mechanical watch and why smartwatches have potential.

Technology has come a long way since the first computer. Smartwatches today are very much an achievement of miniaturisation of technology. I recently used an Apple Watch Series 2 to find out if technology has come far enough to replace my mechanical watch, today I share you my findings.

Programming on Apple Watch

Serious about crazy experiments

Feb. 16, 2017
Programming with VIM over SSH on Apple Watch using a bluetooth keyboard

Over the past years I have been no stranger to crazy experiments, but this time I really wanted to push it into the extreme: programming on an Apple Watch. Would it be possible to actually write code on such a tiny device? Why even bother? This post is about the case for crazy experiments, and why you should try too!

iPad Pro next to my primary machine

Using it with Apple Pencil as a creative powerhouse

Jan. 30, 2017
Using iPad Pro with Apple Pencil next to my computer to form a create powerhouse

I wanted see if I can find something better than my old fashioned pencil and paper that I use for designing software as professional developer. I knew iPad Pro from my test last summer, figuring out if it could replace my primary development machine. While it may not be able to completely replace my thrustworthy ThinkPad, it turned out to be a totally different story when it comes to paper.

iPad Pro as primary computer

testing iOS as primairy development platform

Aug. 15, 2016
Is the time right to use an iPad as primary development platform to get some real work done?

The lack of physical clutter, distracting branding, or blinking LED's makes the iPad Pro a textbook example of minimal design. My despiction of distraction explains my interest in using the iPad Pro as only computer to test if it is up to the task. Is Apple's latest effort on iOS enough to enable it to do serious development work?

All blog posts
Creating a USB recovery drive using another MacBook
Creating a USB recovery drive using another MacBook
Using my
Using my "Lemmid (content) Manager" app to edit a blog post while looking at the results side-by-side
Work in progress: most parts removed, the logic board remaining
Work in progress: most parts removed, the logic board remaining
Using my
Using my "Lemmid Count" app to analyse views and traffic an article on willem.com
Precisely adjusting sliders and immediately see their effects, zoom in with a simple pinching gesture while trying different settings.
Precisely adjusting sliders and immediately see their effects, zoom in with a simple pinching gesture while trying different settings.
Landscape photo taken at the Amsterdamse Waterleidingduinen with the Nokia 2
Landscape photo taken at the Amsterdamse Waterleidingduinen with the Nokia 2
Editing a DNS record using my
Editing a DNS record using my "Lemmid Domain" app while preserving context of the entire DNS zone
The Apple Watch Series 2
The Apple Watch Series 2
Oops: the newly installed SSD drive is not correctly fitted in the PCIe slot! An expensive mistake!
Oops: the newly installed SSD drive is not correctly fitted in the PCIe slot! An expensive mistake!
Drinking happy beers: I found myself an iPhone! (2008)
Drinking happy beers: I found myself an iPhone! (2008)
Classic Rolex advertisement - highlighting the functionality first
Classic Rolex advertisement - highlighting the functionality first
Reveal available keyboard combinations by long-pressing the CMD-key in any app
Reveal available keyboard combinations by long-pressing the CMD-key in any app
Disconnecting the headphone cable
Disconnecting the headphone cable
Composing multi layered images by dragging, dropping, rotating, resizing in a matter of seconds. Optimised tablet apps help you achieve alignment precision using guides and rulers.
Composing multi layered images by dragging, dropping, rotating, resizing in a matter of seconds. Optimised tablet apps help you achieve alignment precision using guides and rulers.
The wallet allows quick (and naked) access to the phone
The wallet allows quick (and naked) access to the phone
Importing all photos into Shotwell caused my tablet to run a little hot (as it generated new thumbnails) - a problem solved using an rather analogue solution: a ventilator
Importing all photos into Shotwell caused my tablet to run a little hot (as it generated new thumbnails) - a problem solved using an rather analogue solution: a ventilator
Adjustable straps without loose ends.
Adjustable straps without loose ends.
Smart Keyboard Folio (left) and the new Magic Keyboard (right)
Smart Keyboard Folio (left) and the new Magic Keyboard (right)

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