Perhaps you’re starting to doubt your IT skills, or are simply shouting obscenities to the computer’s open carcass in rage and frustration. However, the question you should be asking yourself at this stage is not how much you know or think you know about IT, but know much you know or think you know about electronics?

Altough IT is a science on its own, many ‘self-made IT gurus’ tend to make the (honest) mistake to forget that first and foremost, the world of computers is governed by electronics. Like IT, electronics is a fascinating, complex and broad science that studies “the flow of charge through various materials and devices” (Wikipedia, 2008).

What are they?

One particular component I would like to draw your attention to is to capacitors. In dummy terms, capacitors are in a way like little bateries, as they store electric energy between a pair of conductors (called plates). These plates are separated by an insulator (i.e.: non-conductive material) known as dielectric. Dielectrics can be, in theory, any non-conductive material such as air, porcelain, chemicals (e.g.: electrolytes) and teflon. Besides storing energy, capacitors can have other applications such as filtering, signal processing and power conditioning; and the type of dielectric implies for what application it would be best used for.

What is the problem?

The thing is that capacitors can age, particularly the electrolytic ones which use chemicals as its insulator. A while ago I was having a hard time with a computer I built. The system would simply freeze when my soundcard emited a sound, when I moved the mouse or at other simple tasks. I formated and reinstalled the operating system several times, troubleshooted all expansion cards and drives, tried different operating systems and flashed the BIOS; yet nothing worked. After opening my computer for the 100th time, I noticed that some of “those little aluminium cylinders” in my motherboard looked funny. After replacing the motherboard (which was out of warranty), everything started to work as it should. Here are some visual sympthoms of capacitor problems which I witnessed:

• Swollen or bulged caps: When the ‘top’ of the capacitor looks like its bulged. This is due to presure being built inside it.
• Leaking substance: When you can see a substance (mostly a black or brown crusty substance) coming out of it. That is the electrolyte, and yep: It shouldn’t be coming out!

What should I do first?

If your system and/or the failing component is under warranty, your first option should be to activate the warranty and have it repaired or replaced. For those with components out of warranty however, replacement can be quite drastic. Particularly if the problem is narrowed to a few capacitors. However, the best remedy is prevention. Here are some pointers on how to prevent being a victim of capacitors plague.

• Temperature: Keep your system cool. Electrolytic capacitors are sensitive to temperature and they will age faster if your system is too hot.
• Solid Capacitors: Look for motherboards and other components with fewer electrolytic capacitors as possible, as solid capacitors are more resistant to temperatures and more suitable for high-frequency applications.

However, certain systems could be simply doomed to failure due to poor design. I have a Linksys WAG54G v2 ADSL router and I noticed that its switched ports wouldn’t work with 1Gb network adapters unless I forced them to 10Mb (no, forcing to 100Mb wouldn’t work either). I did some research on the internet and a narrowed down the problem to (you probably guessed) capacitors. Basically the WAG54G was poorly designed and it overheats quite a lot, thus damaging the capacitors.

What should I do next?

Problem is, once a capacitor is damaged there is no other option rather than replacing or repairing the unit. This is why I am currently on a mission to learn a little bit more about electronics; at least enough to be able to test for defective capacitors (and other components) and learn how to replace them. And my suggestion to all other IT gurus out there is to do the same. The good news is that there is a lot of information on the Internet for us to get started. Here are a few ones:

• Wikipedia – Capacitors: This article will introduce you to capacitors, what they are, the different types, their applications, etc.
• HowStuffWorks.com – How Capacitors Work: If the previous article was little too much of a heavy reading you might want to check this one first (this is not a criticism! I read this one first as well).
• Wikipedia – Capacitors (component): This article gets a little bit more pratical as it discusses in more detail the different types of capacitors, their applications and their disadvantages.
• Wikipedia – Electronic color code: Believe it or not, electric components aren’t coloured just to look cute. Those colours actualy have a meaning, and understanding them would help you know the value of the capacitors (and other components such as resistors) in order to replace them.
• Wikipedia – Capacitor plague: This article discusses the premature failing of capacitors, giving a particular emphasis in computer electronics (e.g.: motherboards). It also gives some background information about the infamous industrial spionage case that plagued Taiwan with defective capacitors.
• Silicon Chip Online – Motherboard Capacitor Problem Blows Up: This article gives some good background information about the capacitor plague epidemic of the early 2000s that pestered several motherboard manufacturers.

I’m up for it!

Ok, so you had enough of theory reading and you want to get your hands dirty. Fair enough! First things first, consider that you will have to get a good set of equipment such as a good soldering kit, desoldering tools and of course: quality capacitors. In the UK, a good place to by all this equipment is Maplin. But before you start taking your credit card out of the wallet, I strongly recommend you visit capacitorlab.com. It is the best site I found so far with tutorials, pictures, suggestions, etc.

This is the list of hidden pages in the WAG54G router. I have tested these using the 1.01.22 firmware and the work fine. To access these pages, point your browser to your router IP address 192.168.1.1) and append the correct page address (for example http://192.168.1.1/dhcp_reserved.asp).

You can find more information at linksysinfo.org. Let me know if you have any more WAG54G V2 hints!

• Good industry standard support: No proprietary-only stuff, unless it is in addition to standards.
• Reliable: A solid firmware with no bugs.
• Easily expandable: If I add a new disk to the array, I shouldn’t have to format any disks.
• Fast: Both network access and disk access.
• Good support and active community: To have my questions answered and to promote enhancements to the product.
• Extra features: Media streaming, download stations, external USB connections, web server and any other interesting set of features would be a plus.

The first option I came across was Techus, but I dismissed it immediately after some negative reviews. Then after reading some reviews about Infrant ReadyNAS NV+ (followed by Infrant’s acquisition by Netgear), I thought I had finally made my choice. But when I called the distributor to place an order, he mentioned that Infrants ReadyNAS was out of stock and they were currently renegotiating their contract with Netgear (Infrant’s new owner). He immediately suggested that I looked at the Synology CS-407 instead, which has a plethora of interesting features.

According to reviews, the CS-407 is quite fast. It also support standard RAID technologies (RAID 1,5). At first I was concerned that the CS-407 had no NFS support, but I have no immediate plans to use NFS in my network anyway and moreover, I found out by reading at some Synology related forms that it is relatively easy to add NFS for it anyway.

As for the RAID methods, what I am really apprehensive about is the ability to expand into my NAS device (i.e.: add more disks) without the need to format any disks, a feature that Infrant claims that their proprietary X-RAID technology (available on the ReadyNAS) can do.

I decided to download the Synology CS-407 User Guide to see if I could get some of my questions answered, and I found some very positive information in there:

• Although the CS-407 doesn’t have the hot-swap trays that the ReadyNAS has, the CS-407 is still a hot-swappable unit. Perhaps not having such trays is what makes the CS-407 smaller than the ReadyNAS?
• The manual clearly explains that it is easy to expand the unit (i.e.: replace disks with higher capacity ones) without having to format the disks. So what’s the deal with ReadyNAS X-RAID you might ask (well I did)? For what I read, it is simply dumb-proof: It changes the RAID technology according to the amount of disks added, and takes care of storage expansion with very little user intervention. Well I think I can handle RAID without needing my mom to change my diapers.

My last concern was with the ammount of built-in RAM. The CS-407 comes with 128MB, compared with the ReadyNAS which comes with 256MB (which you can also add more memory to it). However, CS-407 seems to be doing very well in its reviews, and I guess that the amount needed is really down on how heavyweight (thus RAM hungry) an operating system is; so I guess that I shouldn’t worry about it.

So I got completely sold by the Synology CS-407 unit. Not only it has more appealing features for my needs than theNetgear’s ReadyNAS but it is cheaper too! However, I was about to place an order for the CS-407, when I decided to read about the upcoming Windows Home Server (WHS) Units to be released Mid/2007, which are focusing on Network Storage. I briefly tried WHS Release Candidate 1 and I must say that WHS has some quite interesting features. However, I also have my reservations about certain “features” and claims which, I will be discussing in an upcoming post.