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Replace your UPS battery

Dave Farquhar Hardware June 19, 2017May 22, 2022APC, Batteries Plus, best buy, home depot, Micro Center, recycling, red wire, usb port

My UPS started squawking one Friday evening, the tell-tale sign that the battery was dead or dying. When that happens, it’s time to either replace the UPS battery, or replace the entire UPS. Hopefully you can just replace the battery. Here’s how to replace your UPS battery.

Dave Farquhar

David Farquhar is a computer security professional, entrepreneur, and author. He started his career as a part-time computer technician in 1994, worked his way up to system administrator by 1997, and has specialized in vulnerability management since 2013. He invests in real estate on the side and his hobbies include O gauge trains, baseball cards, and retro computers and video games. A University of Missouri graduate, he holds CISSP and Security+ certifications. He lives in St. Louis with his family.

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What happened to CompUSA?

Dave Farquhar Retro Computing June 15, 2017March 27, 20241990s, acer, Circuit City, home depot, Micro Center, radio shack, Retailing

Readers of a certain age will remember CompUSA, a defunct big-box computer retailer. What happened to CompUSA? It went out of business, then came back as an undead brand, then went away again.

In some ways, CompUSA was the epitome of 1990s computer retail. It had huge big box stores with aisles of software and upgrades. It sold desktop computers, including its own house brand, Compudyne, manufactured for CompUSA by Acer. But the business model didn’t work as well in the 21st century.

Dave Farquhar

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Micro Center’s Inland ProHT 88037 USB powered speakers

Dave Farquhar Hardware May 7, 2015July 13, 20161980s, Micro Center, usb port

Micro Center sells a pair of $5 USB-powered speakers. You’re either going to read the next sentence or you aren’t.

Still with me? Great. Let’s talk about them.

Dave Farquhar

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Build the best, most secure wifi in your neighborhood

Dave Farquhar DD-WRT, Servers and Networking March 24, 2015August 26, 2017AES, android, apple, cat5, DDWRT, lowercase letters, malware, Meraki Wifi Stumbler, Micro Center, netflix, Roku, SSID, TL, wi-fi

My neighbor asked me for advice on setting up wi-fi in his new house. I realized it’s been a while since I’ve written about wi-fi, and it’s never been cheaper or easier to blanket your house and yard with a good signal.

Blanketing your house and yard while remaining secure, though, is still important.

Dave Farquhar

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What I did for Mother’s Day

Dave Farquhar Hardware, security, Windows May 12, 2014August 28, 2018CIO, compaq, dell, hp, malware, Micro Center, psi, windows 7, Windows XP

Last month, Rapid7’s Trey Ford appealed to security professionals:

You have an opportunity to be an ambassador. When you see XP out there, have an adult conversation, educate in terms that others will appreciate. Your actions and words reflect on the entire community.
As the family CIO/CSO – look for the smart investment. There are options that will make your life easier. A small investment is a lot easier to stomach than compromised shopping/banking/credit card credentials (or identity theft.)

Dave Farquhar

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The world’s fastest budget PC

Dave Farquhar Hardware February 25, 2014February 23, 2014Broadcom, christmas, compaq, firewall, hp, intel, Libre Office, Micro Center, new hardware, office 2010, PCI Express, pcie, pentium d, pfsense, SUBSYSTEM, windows 7, Windows XP

So, a relative’s PC was getting a bit aged, and runs Windows XP, barely, so I talked them into an upgrade. I noticed that Micro Center had HP/Compaq DC5700s for $99. They were standard issue office PCs a few years ago, and there are a lot of them in the refurb channel. We went and got one over the weekend.

“What are you going to do with that?” the sales rep asked. “We only use them as cash registers.”

“Word processing,” I said.

“You sure you want to run Windows 7 on an 8-year-old PC?”

“I wrote the book on running Windows on older PCs. Literally. It’ll be fine.”

I hate calling rank like that, but sometimes it’s what you have to do.

And really, for $99, it’s awfully good. Web browsing is plenty fast, Libre Office runs fine on it, and think about it. Windows 7 retails for $100-$109. So it’s like getting the hardware for free. Or Windows for free, however you want to look at it.

Dave Farquhar

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Upgrading a D-Link DIR-615 to DD-WRT

Dave Farquhar DD-WRT, Hardware, security, Servers and Networking December 2, 2013January 31, 2022AES, CGI, code execution, d-link, dd wrt, DDWRT, firefox, Micro Center, Universal Plug and Play

Last year I bought my mother in law a D-Link router, an oddball DIR-615 revision E1 that was only sold at a few stores. It was supposed to be a Fry’s exclusive, but I bought hers at Micro Center. It worked for a while, then gave her trouble, so this year I was working with it again, and when I was setting it up, I noticed it had some security vulnerabilities–remote code execution, UPnP vulnerabilities, and who knows what else. So that got me some practice upgrading a D-Link DIR-615 to DD-WRT.

DD-WRT’s track record and attitude towards security research could be better, but I’d rather trust my mother in law to DD-WRT’s B+ security than D-Link’s F.

Dave Farquhar

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Unintentional showrooming

Dave Farquhar Retail October 28, 2013November 22, 20181990s, best buy, camcorder, kindle, Micro Center

My mom asked me a few weeks ago to recommend a tablet or e-reader. She’s really only interested in reading, so that pretty much answered half the question. You can read on a tablet, of course, but when you sit down to read on one, it’s almost a guarantee you’ll end up doing more than just read a book. You’ll see that e-mail notification and you’ll check it, and next thing you know, you’re on to something else.

So… Kobo, Nook, or Kindle? For me, it was an easy decision. The Nook was the best hardware at the time, so I went with a Nook. Ve hev vays to get the books we want onto the hardware we want, but Mom doesn’t want that hassle. She just wants to be able to buy the books she wants and read them right away. Amazon’s done a hardware refresh, so their hardware is as good as any other at this point, if not a little better, and they have the largest library of books, so it was an easy decision. The newest Kindle Paper White it is.

So, the day after it came out, she went to the nearest Best Buy to buy it… and ended up ordering it from Amazon. That practice is called “showrooming,” and retailers hate it, but sometimes they shoot themselves in the foot. This was one of them. Read more

Dave Farquhar

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Read this if you have a D-Link router

Dave Farquhar security October 15, 2013August 3, 2017capacitor, d-link, Micro Center, tp link, vulnerability

Leave it to a security vulnerability to interrupt a perfectly good discussion, but it doesn’t get much worse than this. If you have an older D-Link router, it’s possible to completely bypass the authentication on its administrative web interface.

Dave Farquhar

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