Review of "VirtualBox 3.1 - Beginner's Guide" book.

“VirtualBox 3.1 - Beginner’s Guide -- is a book released by Packt, a publishing company which produces books and eBooks for administrators, developers, but also for newbies. This book is organized in 8 chapters, each chapters being organized in more parts, making it easier to learn and understand what the book contains. A free chapter (like a demo for you) is available for download here.”




This is a book designed for the beginners, as the title say, but I would definitely recommend it to anybody (even to the experts) who would like to use the virtualization. It starts by telling you the minimum resources your computer should be having. Whether your on Windows on Linux, you don’t have to worry, because the whole process, from starting the download to finishing the installation is explained clearly in words, and with the help of images at every step. Whether you had never “touched” VirtualBox ever before or not, it is practically no way to get stuck.

I have to tell you that the Guide is designed for VirtualBox 3.1, the newest version of VirtualBox being 3.2.6 now. However, 99% of what is presented in this book is still correct. VirtualBox has been created by Sun, which has been recently bought by Oracle, who, of course, got everything Sun had (including VirtualBox), in their “property”. Even if after that significant improvements were done to the VirtualBox ( guest operating systems run mainly better now), many people say that Oracle killed the VirtualBox, because there are currently several problems present. However, as I’ve already told, 99% of what is in this book is still applicable, because, theoretically, everything remained the same.

I told that I recommend this book even to the experts, because, even if it explains things like configuring (in a basical way) VirtualBox and downloading an image of an operating system, installing it and running that OS, the author also explains things that I couldn’t pass using my own knowledge. It explains anything, from 3D hardware acceleration for the guest OS, to the best configuration of the HDD, and from the optimal network configuration, to the remote control of the operating system (these are advanced things). Of course that it also explains you what you can do with a virtual operating system (this is useful if you come from Windows for example, and you have never used Linux before).

The reason for which the author chose VirtualBox is simple in my opinion. It offers anything a newbie or an expert would wish to do via virtualization, and more than this, it is free. If you are a beginner in virtualization and you buy this book, I recommend you reading it all (there is a common English used, so even if you’re not a native English speaker, like me, you’ll surely understand anything), or, even if you know how to use VirtualBox, there is a possibility to get stuck somewhere, so having this book on your desktop would be a real help in this situation.

At the start of each chapter, there are some lines which tell you exactly what you’re going to learn. After you finish each chapter, it will give you advice on what to do (eg: to continue practising what you’ve learned), and it will also summarize all that the chapter has covered. At the end of the book, there are more quizzes which will help you to verify the knowledge you accumulated. This is something that I like and I think that they are really useful for everybody.

To conclude, I think that “VirtualBox 3.1 - Beginner’s Guide” is a book that is worth buying, because it addresses to absolutely anybody who uses or intends to use the virualization on his/her computer.

Nexus One, after three weeks.

I now have about three weeks since I got my Nexus One, so I'll tell you my experience with it. First of all, it's the best phone I've ever touched. It looks, feels, and moves excellent. So, here are its specifications: 1 GHz Snapdragon processor, 512 MB RAM and 4GB storage card included. So, very powerful hardware.

It has a beautiful 3,7" capacitive AMOLED touchscreen, and it is a pleasure to view anything on it. Also, it has a 5-megapixel camera, with (single) LED and video recording capability. The battery has 1400 mAH, but because of the hardware, if you use it intensively it will keep you about 2 days. I am really satisfied with battery's life

Android, its operating system, is made and developed by Google, and is one which promises a lot. It's the best OS for mobile devices, in my opinion. It is the direct competitor for Apple's iPhone OS, since it comes strongly behind. Apple's AppStore has now about 180 000 applications, but the Android Market grows fast, having until now about 50 000 apps available.

Here are some problems, with the Android Market. Anybody is allowed to post any app he wants, so Google is probably not testing the applications that are in the Market. There are some ones even infected, so this is a risk for users. But it's better than how it is in the AppStore, where Apple approves and denies what he wants without any reason. One thing is clear. The Android Market grows. And the best of all, there are only free applications inside.

So, let's return to the phone. I have two words to describe what it can. Total customization. I hope you understood what I wanted to say. You have 5 screens, you can customize them how you want, you can add folders, plenty of widgets, shortcuts, you can open what application you want, let it open, open other, return to the first one without closing the other. The phone does a very efficient multi-tasking, the applications work like they are connected to each other, you have lots of options inside the apps, and on that screen.....everything is amazing.

However, I've experiencing some things that are not really ok with the phone:

• The phone started peeling off at the bottom. I think that it's from that sleeve case I got in the pack. Now I'm not using it anymore, so the phone is ok (no more peeling observed)
• When I wanted to wake up the phone, the screen didn't turn on at all. Nothing worked; I've even tried to keep the power button pressed for a few seconds, but the phone didn't wake up. The solution was to remove the battery and then turn the phone on (this happened two times).
• After keeping the phone charging for longer time, it heats quite much, but not excessively so this is not a problem.
• The power led indicator sometimes turn green, even if the phone has not been charged completely yet (it should be orange).
• The screen has also some problems, sometimes. It happened about 3 times (I think) for the touchscreen to be inaccurate when I was writing something with the keyboard(this is not a big problem). Pinch-to-Zoom works excellent in Maps, Browser and Pictures. However, via a painting application, it is obvious that if the multi-touch is used and the fingers are moved in aleatory directions, the screen is highly inaccurate. It is not known if this is a hardware or software failure, or just this is the way screen behaves, but I'm sure that somehow it will be fixed.

These were the only problems I experienced. The phone has also a trackball, which is very useful in different tasks. It also lights if there is something that you need to be notified about. What else I must tell you is that the soft buttons (back, menu, home and search) must be pressed above in order to be used. They work perfectly (don't believe the others who say they are not working as they should).

The sound when you receive a call is not high enough to hear it. I mainly hear its vibration, not its ringtone. What seems strange is that there was not implemented any file browser on the device by default. However, third party applications of this type are found on the Market.

And the biggest problem. If you search something in the Market, you can't delete that! Very unpleasant. If you search for example "gifts for my girlfriend", you won't be able to delete that so she might see that. I think that this is the biggest problem of this phone. There is a possibility to delete this history, but the phone needs a modified rom and this will void your warranty. Browser's history can be entirely deleted without any problem.

But mainly, the phone is amazing. It is everything I wanted. I've been using an iPhone for 1 year and a half, but the Nexus One is like a fresh breath. It's something new, something faster, something better. I've been using it in U.S. with a Vodafone Romania SIM, and I didn't experience any problem with the signal (you probably heard about this), using the phone on T-mobile, AT&T and Verizon. It costs about $565 in the U.S., with all tax included.

Testing the iPad (+video).

A few days ago I had the opportunity of testing the product which Apple says that it's a revolutionary one, the iPad (they said the same when they launched any other product).

Firstly, I'll tell you its specifications. It has an Apple A4 1 GHz processor, based on ARM technology. The storage memory varies between 16, 32 and 64 GB, and, related to RAM memory, this is a complete mystery (yet). It is known that physically it seems to be having 512 MB of RAM, but in practice, it reveals only 256 MB of RAM (showed by different tests). It is certain only that the RAM is integrated into the chip of the processor.

It also has a 10 inch capacitive multi-touch screen, perfect for almost anything. On the connectivity side, we have the Wi-Fi model, which starts at $499 with 16 GB of storage, and the Wi-Fi + 3G model which is going to be available soon, this month. The battery offers 1 month for stand-by, and about 10 hours when surfing web on Wi-Fi and stuff like that.

On the Apple Store I've waited for a few minutes after I got one to play with (everybody was running to get one to test when somebody finished testing one). I think that there were about 15-20 iPads available (it is a quite big store, in Dadeland Mall, Miami).

The first sensation was that it was fast. But not as fast as I was expecting, but it was pretty good. The applications are launching like on the iPhone (slowly, showing who made them or things like that), and some of them really looked very well. But several were made especially for the iPhone, and looked very bad because they were running at a low resolution (I'm sure that this will be a problem for a long time).

I found it difficult to play with it using its accelerometer, considering that I used an iPhone for about 1 year and a half, and now I have the Nexus One. It is an updated version of iPhone OS, so the menus are updated in many basic applications (they look really good).

Many fans of Apple said that the iPad is very fast, faster than even the Nexus One. I don't agree with this. They probably said this even without ever touching a Nexus. It is clearly faster than the iPad.

There have been reported several problems with the iPad after only a few hours after it was launched, many users complaining that on their Windows machines and especially when connected to USB hubs the iPad refuses to charge. Apple says that when it gets into sleep, it starts charging automatically, but they can't actually prove that this happens at all times, because there is no icon indicating if it charges or not. And there are also problems with weak Wi-Fi signal and connection problems on LAN configurations.

And if you want one, if need to know that it has no camera and no GPS. You can buy additional accessories, and even if the iPad starts a $499, you can easily pass $1000, considering that Apple has only quite expensive accessories.

Apple has reached again, a great success with the iPad. In the first day of selling, the sells with the pre-orders passed 300 000 units. This is completely astonishing. To compare, Google sold only 135 000 Nexus One units after 74 days, while there were about 1 million iPhones (first generation) sold after the same period of days. I don't know how Apple does this, but it is known that Steve Jobs has currently the most profitable company in the domain of mobile devices.

Below is a video taken with my Nexus One, while I was testing some of iPad's functionalities:

Nexus One. Do you like it or not ? :)

Nexus One has been recently launched, being already very popular. The phone is very performant, having inside a "monster" Qualcomm QSD 8250 Snapdragon ARM processor which runs at 1 GHz, assisted by 510 MB of RAM, which makes the device one of the most powerful available on market. It has 512 MB storage memory, and a 4GB microSD card included, with the possibility to insert storage cards up to 32 GB.

The screen (capacitive one, of course) has 3,7 inches, and a resolution of 480 x 800 pixels, with 100,000:1 contrast ratio and 1 ms response rate. It has a battery which a capacity of 1400 mAh, which offers up to 290 hours on standby, 10 hours while talking, and 5 hours while browsing. The camera has 5.0 megapixels, with recording possibility, geotagging, auto focus, and flash LED.

What I don't like about it is the plastic it is made of, which gives a sensation of cheap phone. Users complained, so far, about problems with connection through 3G networks. The phone runs on 2.1 version of Android, and it is available without any contract (network free) for 529 dollars.

What do you think about the Nexus One? Do you like it or not? Do you have plans about buying one, or you have already got one?