When Is a CPU’s Cache Flushed Back to Main Memory?

If you are just starting to learn how multi-core CPUs, caching, cache coherency, and memory works, it may seem a little bit confusing at first. With that in mind, today’s SuperUser Q&A post has answers to a curious reader’s question. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A ... Read More »

Which Chromecast Should I Buy (and Should I Upgrade My Old One)?

The Chromecast has been out long enough to have several generations of hardware. But what’s the difference between them, and should you upgrade to the newer versions? Originally released in 2013, the original $35 Chromecast flew off the shelves thanks to its ease of use, excellent app support, and the dead simple way it allowed people to sling YouTube, Netflix, ... Read More »

Is It Safe to Use a Hard Drive While rsync Is Running?

If you are just getting started with rsync for the first time and have multiple large hard drives to make backups of, is it safe to actually use one or more of them during the long process? Today’s SuperUser Q&A post has the answer to a worried reader’s question. Today’s Question & Answer session comes to us courtesy of SuperUser—a ... Read More »

How to Set Up Two-Step Verification in WhatsApp

Two-step verification is an important security protocol that is becoming more popular. Instead of just needing a password, you need your password and something else to log in to your account. This makes it much harder for attackers. WhatsApp has always had the “something else”—it’s the phone number you associate with your account—but until recently, you haven’t been able to ... Read More »

What Is PlayStation Vue, and Can It Replace Your Cable Subscription?

Getting away from traditional TV service is becoming more and more popular, with streaming TV services leading the charge. Today we’re going to take a closer look at Sony’s take on TV streaming: PlayStation Vue. What Is PlayStation Vue? PlayStation Vue is Sony’s take on traditional TV. It streams live TV over the internet, with most of your favorite cable and ... Read More »

What Does a PC’s BIOS Do, and When Should I Use It?

Your computer’s BIOS is the first thing that loads when you start your computer. It initializes your hardware before booting an operating system from your hard drive or another device. Many low-level system settings are only available in your BIOS. Modern computers predominantly ship with UEFI firmware, which is the successor to the traditional BIOS. But UEFI firmware and the BIOS ... Read More »

How to View CBR and CBZ Comic Books in Calibre

If you use Calibre, the veritable Swiss Army knife of ebook management, you might not realize it can also view and organize digital comic books—though it’s a little janky out of the box. How Calibre Handles Comics A fresh installation of Calibre handles ebooks right out of the gate, without any tweaking. Throw some EPUB, MOBI, or other ebook formats at ... Read More »

What Are the Eight White Squares Surrounding Resizable Objects Called?

It is the kind of question that if you ask ten different people, you will likely get ten different answers, so what are those eight white squares actually called? Today’s SuperUser Q&A post has some answers for a frustrated reader who wants to use the correct term in his article. Today’s Question & Answer session comes to us courtesy of ... Read More »

How to Set Up Minecraft So Your Kids Can Play Online with Friends


Your kids love Minecraft, their friends love Minecraft, and they want to play it together when they can’t be in the same physical place—and they’re begging you to make that happen. Don’t worry, you don’t have to figure it out on your own: we’re here to help. Setting up a private server for your children and their friends to play ... Read More »

How Does Windows Decide Which of Two Files With Identical Time Stamps Is Newer?

What does it mean when you have two identical files with identical time stamps, yet Windows says that one file is newer than the other one? How can that be? Today’s SuperUser Q&A post helps a confused reader solve a time stamp mystery. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven ... Read More »