Wednesday, 11 March 2009
Apple should be more like Dell
Monday, 23 February 2009
DIY software
Tuesday, 10 February 2009
Weird Mac file copy bug - or is it a feature?
The Windows part of the website is created on a Windows PC and the Mac part is created on a Mac. Of course, I could simply use one or the other to do the whole website, but it's useful to experience both platforms because I write about both the PC and the Mac.
I keep a copy of the website in a folder on each computer. On the PC it's the htdocs folder in C:\Xamp (Xamp is a web server based on Apache and is handy for testing), on the Mac it is also the htdocs folder, but this time it's in Applications\Mamp (Mamp is a web server based on Apache and is handy for testing). The problem is how to keep them in sync.
One way is to drag the htdocs folder to a USB memory drive, take it to the other computer and drag it off. It can be done over the network too. The way Windows and OS X works when you do something like this has caught me out and files have been going missing on the Mac. Is it a feature or a bug?
If you drag a group of files and folders from one place and drop them on another place there is a conflict if the destination contains files or folders with the same names. Both Windows and OS X ask you if you want to replace the destination files and folders with the source, which is fine, but Windows and OS X work differently.
The problem is with subfolders. When the source and destination both contain a subfolder with the same name Windows asks if you want to replace the destination with the source. If you say yes, then the files in the source subfolder are copied to the destination subfolder and files with the same name are overwritten. Files with different names are kept. What you end up with is a folder that combines the files from the source and destination. This is exactly what I wanted.
Do this in OS X and you are asked if you want to replace the subfolder. If you say yes then the folder in the destination is deleted and replaced by the source folder. It really is deleted and it's not moved the the Trash. What you end up with is not a combined folder that contains files from both the source and destination, but just the source.
This isn't what I wanted. and it's how I have been losing files. I assumed OS X would only replace the files in the subfolder with the ones I'm copying from the PC, leaving the ones I'd created on the Mac, so I'd end up with a synced folder. Instead files I'd created for the Mac part of the website were being deleted because the subfolder was being deleted and replaced.
This is obviously something you need to be wary of when copying files and folders to update a destination folder.
Thursday, 22 January 2009
iPod repeats same song
Monday, 22 December 2008
How fast should Wi-Fi be?
The speed at which data can be transferred over wireless networks is increasing and there are some tempting new technologies that push the limits even higher than was ever thought possible just a few years ago. An old computer of mine still has an 11Mbit/s 802.11b Wi-Fi network adaptor connected to a USB 1 socket and those standards are positively ancient. They were replaced by the much faster 802.11g standard that offers up to 54Mbit/s and adaptors plug into USB 2 sockets. The latest Wi-Fi standard is 802.11n, and while it hasn't yet been finalised, you can buy equipment today that is based on the draft specification. The upper limit for this technology is 600Mbit/s, but do we need it though?
There isn't a single answer to this question and it depends on what you want to do. If all you want to do is to browse websites, send and receive email, watch online videos, or view online photos, then the old 802.11b standard may be all that you need and buying top-of-the-range ultra-fast networking gear would be a waste of money. The thing is, your internet connection is probably only around 5Mbit/s. Of course, ISPs try to tempt you with offers of up to 20Mbit/s connections, but you never connect at the maximum speed advertised and in the real world it's hard to connect at more than 5Mbit/s.
If you think about it, an 802.11b wireless connection offering up to 11Mbit/s should easily be able to cope with a 5Mbit/s internet connection, after all it's only half the maximum thoughput. In the real world, however, you never achieve the maximum quoted speed and you'll only get a quarter of the maximum for a technology.
It's an interesting exercise to test your connection speed at a website like www.speedtest.net Just click a server and the download and upload speeds are tested. The results may vary slightly depending on the time of day and how many people are using the internet, so try it at different times. My six-year-old PC with an 802.11b Wi-Fi adaptor achieved a speed of 1350kbit/s (1.35Mbit/s), which is actually quite fast when you think about the 512kbit/s connection speeds available when broadband was first introduced. It is certainly fast enough for web browsing, email and other internet activities. You would only notice the slow speed when downloading large files like Linux distros.
A newer PC with an 802.11g Wi-Fi adaptor recorded a speed of 2880kbit/s (2.8Mbit/s), which is roughly twice as fast. It doesn't make browsing the web or email any faster because these operations don't need a lot of bandwidth, but it's certainly an advantage when it comes to downloading large files. A PC connected to the router using an ethernet cable recorded an identical connection speed to the 802.11g Wi-Fi adaptor, suggesting that the limiting factor is not the adaptor or wireless technology, but the router's actual internet connection speed. It usually reports that the connection is 4 to 5Mbit/s, but as always what it says and what you get are two separate things. So clearly 802.11g is perfectly adequate for my 4-5Mbit/s internet connection and there would be no speed benefit from faster Wi-Fi technology until there is some way of estabilishing a faster connection over the telephone cables from my house to the telephone exchange.
It shows that if you have a single PC you don't need anything other than old fashioned 802.11g Wi-Fi for internet access. However, if you have two or more PCs connected using a home or work network and regularly transfer large files between them, then the newer and faster technologies that are available are important because they significantly speed up the process. But how often do you transfer gigabytes of video or audio clips between your computers? If the answer is not very often, then save your money and opt for older and cheaper technology rather than expensive and exotic cutting edge kit. Web browsing is limited by your internet connection speed and not the Wi-Fi standard.
Thursday, 11 December 2008
Firmware update for MacBooks
There is an old saying that goes back many years. I don't know who said it, but it's good advice: Don't buy version 1 of anything. The latest MacBooks are a point in case and it seems that a few owners have been experiencing problems with them.
For example, the new trackpad, which is one of the new features Apple highlighted at the launch, doesn't click for some people. Is it a hardware or software fault? It's not clear. Instead of paying Apple's sky high prices for RAM, some people have bought RAM from popular online memory suppliers, but have found that crashes can sometimes occur. Some MacBooks won't stay asleep. You shut the lid and it goes to sleep, but then it keeps waking up every minute or so. The Nvidia graphics chipset has also been causing problems too and the MacBook might incorporate chips with known problems. You'll find a useful article here that has links to other reports going into more detail.
A firmware update has been produced and if you are using a new MacBook you should receive it through the usual software update facility (there's a direct link below too). It'll be described as an update to improve stability, but it's basically fixing a load bugs in the original MacBook firmware.
It's always a good idea to wait a while after something new is released, even if it is exceeding cool and from a company like Apple. If you buy a MacBook in the New Year it's not just bugs that you'll be avoiding because here in the UK VAT (sales tax) was recently reduced from 17.5% to 15%, so Apple's UK prices have dropped slightly since the MacBook launch. That's great news.
Sunday, 16 November 2008
Cloud computing - is it safe?
Many people say that the next big thing is cloud computing and that we will all be using it sooner or later, if not already. The term 'cloud computing' means the internet and in some ways it is a return to the old days where large computers in a company held data and software and everyone accessed it through cheap dumb terminals.
It's slightly different now because the internet has made large computing centres open to the general public and not just selected employees in a company. There are many online storage services that offer to store your files, webmail for email, photo sharing and video sharing, online applications like word processors and spreadsheets, and so on.
We are increasingly being tempted by offers to look after our files and cool online applications, but these are early days in cloud computing and not all services that are around now will be around next year or the year after. The problem is that running these online cloud computing services is expensive and it's hard to make a profit. You can only carry on making a loss for so long.
Xdrive, an online storage company that you can use to store files, has recently announced that it is to close. It is not the first to close and it won't be the last. When you use one of these services to store files, for email, photos, or whatever, and they close, it can be very frustrating. How are you going to get all your files/photos/email off the service? Can you transfer them to another service? What if you didn't see the closure notice and everything was deleted? It's enough to put you off cloud computing.
At the moment it is not recommended to store your files/email/photos or whatever online without an offline backup just in case the service closes or has a serious fault and loses your data. If you don't want to do this, at least use two different companies so that if one shuts down you will still have your files/photos/email at the another.