http://www.sabi.co.uk/ Notes mostly about Linux and computer issues en-GB http://blogs.law.Harvard.edu/tech/rss/ notes {at} notes.for.sabi.co.UK Copyright 2008 Peter G. 14000 AMD Intel Microsoft Nintendo Sony CPU OS VoIP file sytem free software hardware performance system administration videogames virtual memory ALSA Debian Fedora GNU JFS KDE Linux MS Windows 2000 MS Windows XP MS Windows PS3 RedHat SUSE UNIX XFS Xbox 360 ext3 Sun, 10 May 2009 18:55:00 +0100 http://WWW.sabi.co.UK/blog/0904Apr.html?090418#090418 I have decided to switch to Atom as the feed format for this site and blog, at http://WWW.sabi.co.UK/changed.atom and this RSS format feed will no longer be updated. This is the last entry that will appear in this feed. web blog XML http://www.sabi.co.uk/blog/0904Apr.html?090418#090418 Sat, 18 Apr 2009 21:30:00 +0100 http://WWW.sabi.co.UK/blog/0901Jan.html?090131#090131 JFS and eSATA perform fairly well when synchronizing a largish filesystem to an external drive. Not surprising, but still worth keeping in mind. Linux performance file system http://www.sabi.co.uk/blog/0901Jan.html?090131#090131 Sat, 31 Jan 2009 10:15:00 +0000 http://WWW.sabi.co.UK/blog/0812Dec.html?081227#081227 Laptop prices have decreased so much that repairing them is not longer so useful, and Linux power management has greatly improved. Linux power hardware laptop http://www.sabi.co.uk/blog/0812Dec.html?081227#081227 Sat, 27 Dec 2008 18:10:00 +0100 http://WWW.sabi.co.UK/blog/0812Dec.html?081224#081224 Lithium-ion batteries age, mine has aged very rapidly especially when warm, and I'll be making minimal use of my new high capacity one. hardware Linux system administration http://www.sabi.co.uk/blog/0812Dec.html?081224#081224 Wed, 24 Dec 2008 18:10:00 +0100 http://WWW.sabi.co.UK/#sourcesSabiwatts?081202 This script is designed to tweak the power related settings of the Linux kernel for normal operation when on permanent power and for low power operation when on battery power. This update fixes two mistakes in the X display enabling/disabling feature. Linux performance laptop shell configuration power Tue, 02 Dec 2008 19:00:00 +0000 http://WWW.sabi.co.UK/blog/0812Dec.html?081201#081201 Just discovered that an enabled but disconnected video output can draw a few watts of power on a laptop. system administration power laptop http://www.sabi.co.uk/blog/0812Dec.html?081201#081201 Mon, 01 Dec 2008 19:45:00 +0000 http://WWW.sabi.co.UK/#sourcesSabiwatts?081201 This script is designed to tweak the power related settings of the Linux kernel for normal operation when on permanent power and for low power operation when on battery power. This update adds disabling X11 video outputs when disconnected in low power mode and enabling connected ones when in normal power mode. Linux performance laptop shell configuration power Mon, 01 Dec 2008 19:35:00 +0000 http://WWW.sabi.co.UK/blog/0811Nov.html?081124#081124 After 9 months of use, my laptop battery now lasts 2 hours instead of 3.5 hours when new. It is in effect a consumable. hardware power http://www.sabi.co.uk/blog/0811Nov.html?081124#081124 Mon, 24 Nov 2008 19:00:00 +0000 http://WWW.sabi.co.UK/blog/0810Oct.html?081014#081014 Automatic routing discovery with OSPF and parallel routing with ECMP combine to give a fairly simple but very resilient network design system administration networking architecture design http://www.sabi.co.uk/blog/0810Oct.html?081014#081014 Tue, 14 Oct 2008 19:50:00 +0000 http://WWW.sabi.co.UK/Notes/linuxKDE.html#docsAWS?080912 From a few sources I have compiled a hopefully complete summary of the Advanced Web Shortcuts that are quite convenient in Konqueror. KDE documentation Linux Fri, 12 Sep 2008 19:10:00 +0100 http://WWW.sabi.co.UK/blog/0808Aug.html?080826#080826 Programs that are note 'setuid' should not override the POSIX/UNIX security system and refuse to run unless the user has 'root' privileges: just checking for user id 0 pre-empts different security architectures, and it is pointless and obnoxious anyhow. UNIX Linux software engineering security http://www.sabi.co.uk/blog/0808Aug.html?080826#080826 Tue, 26 Aug 2008 18:30:00 +0100 http://WWW.sabi.co.UK/blog/0808Aug.html?080822#080822 A new log structured file system has been developed in Japan, and it seems quite mature, to the point it can run extensive performance tests. A log structured filesystems aligns well with file systems Linux software engineering performance http://www.sabi.co.uk/blog/0808Aug.html?080822#080822 Fri, 22 Aug 2008 19:10:00 +0100 http://WWW.sabi.co.UK/blog/0808Aug.html?080812#080812 Cryptic and misleading error messages seem to me fairly common with Kerberos and in this case Kerberos-related software. Much like MS-Windows or MS-Windows related software. This cultural compatibility may also be why Active Directory is based on Kerberos. software engineering Linux MS-Windows http://www.sabi.co.uk/blog/0808Aug.html?080812#080812 Tue, 12 Aug 2008 21:30:01 +0100 http://WWW.sabi.co.UK/blog/0808Aug.html?080807#080807 C#/CIL are somewhat more polished and nicer versions of Java/JVM, but there is a large risks that Microsoft owns enough patents to exclude if it wishes independent implementations of C#/CIL. software engineering patents Microsoft Java C# http://www.sabi.co.uk/blog/0808Aug.html?080807#080807 Thu, 07 Aug 2008 06:45:01 +0100 http://WWW.sabi.co.UK/blog/0808Aug.html?080805#080805 Some new flash hard drives have been launched and they have remarkable speed, low weight and low power consumption. Surely good for laptops, but also for high density mass storage arrays. storage hardware performance http://www.sabi.co.uk/blog/0808Aug.html?080805#080805 Tue, 05 Aug 2008 19:00:01 +0100 http://WWW.sabi.co.UK/blog/0807Jul.html?080718#080718 Indices in data storage systems are used to avoid sequentially a large dataset when only a subset is sought, but for both RAM and disks bulk sequential access is becoming ever faster than random access, making the usefulness of indices lower with time. But flash devices may change that for mass storage at least. performance hardware DBMS http://www.sabi.co.uk/blog/0807Jul.html?080718#080718 Fri, 18 Jul 2008 08:05:00 +0100 http://WWW.sabi.co.UK/blog/0807Jul.html?080711#080711 An article talks about online service unavailability but does not make a vital distinction: when a web shop is not available that's inconvenient because one cannot buy or read somebody else's data, when a web service is not available that's bad because one cannot sell or read one's own data. web business reliability architecture http://www.sabi.co.uk/blog/0807Jul.html?080711#080711 Fri, 11 Jul 2008 06:55:00 +0100 http://WWW.sabi.co.UK/#sourcesSabiwatts?080709 This script is designed to tweak the power related settings of the Linux kernel for normal operation when on permanent power and for low power operation when on battery power. Thus update adds setting the hard disk APM level which is useful to reduced load cycles when on permanent power. Linux performance laptop shell configuration power Wed, 09 Jul 2008 19:25:00 +0100 http://WWW.sabi.co.UK/blog/0807Jul.html?080709#080709 Thanks to suitable investigation in Linux power management, I am getting several hours of work on my 6 cells battery laptop. The good quality of the LCD screen and backlight look quite important. system administration hardware performance power consumption http://www.sabi.co.uk/blog/0807Jul.html?080709#080709 Wed, 09 Jul 2008 08:50:00 +0100 http://WWW.sabi.co.UK/blog/0807Jul.html?080708#080708 Someone thinks that analyasts and users will do their own programming thanks to advanced tools, but while this is an old unrealized dream, the bigger issue is that the global price for programmers is much lower than the cost of analyst or user time. software engineering outsourcing offshoring http://www.sabi.co.uk/blog/0807Jul.html?080708#080708 Tue, 08 Jul 2008 06:35:00 +0100 http://WWW.sabi.co.UK/blog/0807Jul.html?080704#080704 Current individual computers are often powerful enough to run even poorly written applications tolerably, but I would rather use that power to run several applications well instead of one tolerably. performance system administration programming optimization http://www.sabi.co.uk/blog/0807Jul.html?080704#080704 Fri, 04 Jul 2008 07:20:00 +0100 http://WWW.sabi.co.UK/blog/0807Jul.html?080702#080702 The distiction between the "publishing", "content" culture, and the "transaction", "technology" one is vividly argued in "Burn rate" by Michael Wolff. business networking dotcom web http://www.sabi.co.uk/blog/0807Jul.html?080702#080702 Wed, 02 Jul 2008 21:00:00 +0100 http://WWW.sabi.co.UK/blog/0806jun.html?080630#080630 With a simple wrapper script for OpenSSH commands it is possible to tunnel over SSH via a bastion host fairly conveniently. system administration network administration SSH shell http://www.sabi.co.uk/blog/0806jun.html?080630#080630 Mon, 30 Jun 2008 22:35:00 +0100 http://WWW.sabi.co.UK/Notes/hwNotesReviews.html#toshibaU300u1?080628 Some small updates to my review of my Toshiba U300 laptop. hardware laptop review Sat, 28 Jun 2008 22:50:00 +0100 http://WWW.sabi.co.UK/#sourcesSabishape?080627 The overall logic has not changed much, but the options are slightly different, in particular there is now no default command, and slightly different defaults for bandwidth. Linux networking Netfilter iptables shell shaping IP configuration traffic control Fri, 27 Jun 2008 21:00:00 +0000 http://WWW.sabi.co.UK/#sourcesSabifire?080627 Much improved version of this leaf firewall script with some small improprieties corrected, and rather better internal organisation. The command interface has changed slightly, and now the default on stopping the firewall is to accept all packets. To reject all packets use 'close' instead of 'stop'. There have been quite a few unreleased versions between the previous release and this one. Linux networking Netfilter iptables shell shaping IP configuration firewall Fri, 27 Jun 2008 21:00:00 +0000 http://WWW.sabi.co.UK/#sourcesSabiwatts?080627 This new script is designed to tweak the power related settings of the Linux kernel for normal operation when on permanent power and for low power operation when on battery power. This is a polished and documented version of a script that I have been using for a while. It is not yet configurable, but the defaults embedded in it should be reasonable for most users. Linux performance laptop shell configuration power Fri, 27 Jun 2008 21:00:00 +0000 http://WWW.sabi.co.UK/blog/0806jun.html?080626#080626 Some examples to illustrate different ways to split redundancy and services and users given a fixed number of servers. system administration network administration performance http://www.sabi.co.uk/blog/0806jun.html?080626#080626 Thu, 26 Jun 2008 07:25:00 +0100 http://WWW.sabi.co.UK/blog/0806jun.html?080625#080625 Notably, Toshiba have launched a laptop with a Cell based graphics chip. Which supports the idea that the Sony PS3 was originally intended to have two Cell chips, one for graphics. performance graphics Sony http://www.sabi.co.uk/blog/0806jun.html?080625#080625 Wed, 25 Jun 2008 07:15:00 +0100 http://WWW.sabi.co.UK/blog/0806jun.html?080621#080621 Indices are very important to performance in DBMses, yet often DBAs forget about creating them or compacting them. The conclusion to me is that performance tuning should be as automatic as possible, as while not being as good as good manual tuning, it is more likely to happen. DBMS performance system administration software engineering http://www.sabi.co.uk/blog/0806jun.html?080621#080621 Sat, 21 Jun 2008 18:05:00 +0100 http://WWW.sabi.co.UK/blog/0806jun.html?080620#080620 Python is mostly an alternate syntax for Lisp, which had a reputation for being slow motivating Lisp implementors to create very efficient implementations. Ironically Python implementation are much slower and much more popular. programming Python Lisp performance http://www.sabi.co.uk/blog/0806jun.html?080620#080620 Fri, 20 Jun 2008 17:30:00 +0100 http://WWW.sabi.co.UK/blog/0806jun.html?080618#080618 IPv6 is being pushed by Eropean authorities, and that seems a good idea, as Europe is not as vested in the existing IPv4 based Internet as much as the USA. networking IPv6 business http://www.sabi.co.uk/blog/0806jun.html?080618#080618 Wed, 18 Jun 2008 06:45:00 +0100 http://WWW.sabi.co.UK/blog/0806jun.html?080615#080615 Intel demonstrates an IA32 SMP systems capable of playing a contemporary game with realtime sw raytracing. performance architecture CPU games Intel http://www.sabi.co.uk/blog/0806jun.html?080615#080615 Sun, 15 Jun 2008 11:15:00 +0100 http://WWW.sabi.co.UK/blog/0806jun.html?080616#080616 Google's platform is mostly about large scale read-only best effort publishing, Amazon's mostly about global state transactional e-commerce, and cloud computing could be more about the latter than the former. But it is more likley perhaps to be about small local transactions and small publishing, so neither may have the advantage. business search e-commerce DBMS http://www.sabi.co.uk/blog/0806jun.html?080616#080616 Mon, 16 Jun 2008 21:15:00 +0100 http://WWW.sabi.co.UK/blog/0805may.html?080531#080531 The availability of cloud computing retail from both Google and Amazon means that low initial outlay e-commerce web sites will be even easier to setup. This will favour sites that sell third world labor intensive services to first world customers, as it makes available first world class (and priced) infrastructure that would be difficult otherwise for third world companies to arrange. business clusters e-commerce DBMS http://www.sabi.co.uk/blog/0805may.html?080531#080531 Sat, 31 May 2008 22:00:00 +0100 http://WWW.sabi.co.UK/blog/0805may.html?080516#080516 Except in some really scalable applications large storage pools are rarely necessary, and collections of localized storage pools seem to be easier and cheaper to setup and maintain. storage networking file systems system administration http://www.sabi.co.uk/blog/0805may.html?080516#080516 Fri, 16 May 2008 19:05:00 +0100 http://WWW.sabi.co.UK/blog/0805may.html?080512#080512 Parallel assignment probably is what makes parallel programming interesting, as ordering of side effects is the hard issue, not side effects in general. programming software engineering computer languages http://www.sabi.co.uk/blog/0805may.html?080512#080512 Mon, 12 May 2008 11:21:00 +0100 http://WWW.sabi.co.UK/blog/0805may.html?080507#080507 Parallel assingment can be compiled efficiently and easily and simplifies the basic blocks of programs. programming software engineering performance programming languages http://www.sabi.co.uk/blog/0805may.html?080507#080507 Wed, 07 May 2008 07:06:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080430#080430 An upgraded version of the Linux logging daemon uses MS-DOS shell style syntax. software engineering Linux UNIX Microsoft http://www.sabi.co.uk/blog/0804apr.html?080430#080430 Wed, 30 Apr 2008 17:20:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080406#080406 The checking utilities for XFS have been improved and now take a lot less memory; some approximate rules are given as to how much. system administration performance storage XFS http://www.sabi.co.uk/blog/0804apr.html?080406#080406 Sun, 06 Apr 2008 18:10:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080428#080428 The capacity/size/price ratio of flash disks is expected to increase to 50%/year for at least a few years, which is higher than the current rate of increase for hard disks so they might reach parity in a few years. Good news, even if currently flash disks are bit too slow and way more expensive than that. hardware storage performance http://www.sabi.co.uk/blog/0804apr.html?080428#080428 Mon, 28 Apr 2008 07:50:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080420#080420 Perhaps apart from servers the best applications for multiple CPU chips are development and power saving performance software engineering CPU architecture http://www.sabi.co.uk/blog/0804apr.html?080420#080420 Sun, 20 Apr 2008 21:20:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080417#080417b Building large storage pools is not easy, for single pools up to some hundred TB I think Lustre seems currently quite attractive. file systems storage Linux http://www.sabi.co.uk/blog/0804apr.html?080417#080417b Thu, 17 Apr 2008 21:30:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080417#080417 The large number of patches in RHEL kernels is fruit both of policy and "scratch my itch" practice. RedHat software engineering Linux operating systems http://www.sabi.co.uk/blog/0804apr.html?080417#080417 Thu, 17 Apr 2008 21:15:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080416#080416 Parallelism in clusters can be used to achieve greater speed or reliability or both. Initially it was about reliability, currently it is mostly about speed. operating system performance storage http://www.sabi.co.uk/blog/0804apr.html?080416#080416 Wed, 16 Apr 2008 18:10:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080415#080415 File system performance envelopes have many dimensions, and several are important, because the performance envelopes of common file system designs are rather differently shaped. file systems performance software engineering http://www.sabi.co.uk/blog/0804apr.html?080415#080415 Tue, 15 Apr 2008 19:35:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080414#080414 Looking at some recent 2-CPU and 4-CPU chip tests the 2-CPU ones seem still the most convenient, even if some important applications can take advantage of more CPUs. hardware performance parallelism http://www.sabi.co.uk/blog/0804apr.html?080414#080414 Mon, 14 Apr 2008 21:05:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080407#080407 How to design a cheap reliable storage pool system It is not simple, but a compromise can be found in Lustre and network redundancy. storage networking system administration http://www.sabi.co.uk/blog/0804apr.html?080407#080407 Mon, 07 Apr 2008 21:55:00 +0100 http://WWW.sabi.co.UK/blog/0804apr.html?080405#080405c Rather interesting new about recent CPUs, for example CPU ICs with 410m transistors, and simple and small x86 CPUs architecture hardware CPU Intel AMD http://www.sabi.co.uk/blog/0804apr.html?080405#080405c Sat, 05 Apr 2008 21:20:00 +0000 http://WWW.sabi.co.UK/blog/0804apr.html?080405#080405b Comparison of recetn AMD and Intel CPU chips, including 45nm low power ones. architecture hardware CPU Intel AMD http://www.sabi.co.uk/blog/0804apr.html?080405#080405b Sat, 05 Apr 2008 19:15:00 +0000 http://WWW.sabi.co.UK/blog/0804apr.html?080405#080405 Bad error reporting is common, and I found a particularly galling and classic example. software engineering programming Linux http://www.sabi.co.uk/blog/0804apr.html?080405#080405 Sat, 05 Apr 2008 15:40:00 +0000 http://WWW.sabi.co.UK/blog/0804apr.html?080402#080402 The Linux page cache shows again how incredibly expensive it is in terms of CPU time. Linux performance IO http://www.sabi.co.uk/blog/0804apr.html?080402#080402 Wed, 02 Apr 2008 21:05:00 +0000 http://WWW.sabi.co.UK/blog/0803mar.html?080315#080315 Outsourcing computing services is not quite like buying computing power supply from a utility; it is like using the services of a bank, because it usually involves trusting business critical data to the supplier of those services. system administration project management business http://www.sabi.co.uk/blog/0803mar.html?080315#080315 Sat, 15 Mar 2008 20:50:00 +0000 http://WWW.sabi.co.UK/blog/0803mar.html?080303#080303 The Linux block cache layer has some performance issues probably due to misdesigns and lack of care. Linux system administration performance storage http://www.sabi.co.uk/blog/0803mar.html?080303#080303 Mon, 03 Mar 2008 21:20:00 +0000 http://WWW.sabi.co.UK/blog/0802feb.html?080226#080226 Runtime compatibility with competing platforms makes users prefer the product of competitors, and development compatibility with competiting platforms makes developers prefer the competiting platform. software engineering development Linux MS Windows http://www.sabi.co.uk/blog/0802feb.html?080226#080226 Tue, 26 Feb 2008 21:20:00 +0000 http://WWW.sabi.co.UK/blog/0802feb.html?080220#080220 Someone describes a setup for a 48 drive storage system that creates a single storage pool system administration RAID Linux storage http://www.sabi.co.uk/blog/0802feb.html?080220#080220 Wed, 20 Feb 2008 08:20:00 +0000 http://WWW.sabi.co.UK/blog/0802feb.html?080219#080219 I have bought a new laptop that is more powerful than my desktop, and has enough storage space that I can use it as my main system. Thanks to recent high capacity 2.5" disk drives. storage hardware laptop performance Linux http://www.sabi.co.uk/blog/0802feb.html?080219#080219 Tue, 19 Feb 2008 22:00:00 +0000 http://WWW.sabi.co.UK/blog/0802feb.html?080217#080217 Someone wants to start with a 2+1 RAID5 and thn expand it to a 13+1 RAID5 or a 12+2 RAID6 by adding drives one at a time. That does not seem wise, and better alternatives can be described. RAID Linux system administration storage http://www.sabi.co.uk/blog/0802feb.html?080217#080217 Sun, 17 Feb 2008 11:30:00 +0000 http://WWW.sabi.co.UK/blog/0802feb.html?080216#080216 A large filesystem with a 100 million small files does not look like being a good idea, especially compared to a simple indexed file. Some numbers from a smaller case illustrate why. storage file systems DBMS Linux XFS http://www.sabi.co.uk/blog/0802feb.html?080216#080216 Sat, 16 Feb 2008 12:30:00 +0000 http://WWW.sabi.co.UK/Notes/hwNotesReviews.html#toshibaU300?080219 Just got a Toshiba U300-13U and overall it is quite good, well suited to GNU/Linux, with a few annoying physical issues. hardware laptop review Tue, 19 Feb 2008 08:45:00 +0000 http://WWW.sabi.co.UK/blog/0802feb.html?080210#080210 Some more reports of filesystem checking speed or slowness. performance file systems system administration Linux ext3 XFS http://www.sabi.co.uk/blog/0802feb.html?080210#080210 Sun, 10 Feb 2008 21:40:00 +0000 http://WWW.sabi.co.UK/blog/0802feb.html?080202#080202 Active redundancy implies some degree of coupling, and this by itself introduces common modes of failure. system administration network administration architecture http://www.sabi.co.uk/blog/0802feb.html?080202#080202 Sat, 02 Feb 2008 19:35:00 +0000 http://WWW.sabi.co.UK/blog/0712dec.html?071210#071210 AMD CPUs have much better read latency than Intel ones thanks to HyperTransport. But memory sticks are designed to have high latency as Intel CPUs have lots of onchip cache anyhow. architecture hardware AMD Intel http://www.sabi.co.uk/blog/0712dec.html?071210#071210 Mon, 10 Dec 2007 21:30:00 +0000 http://WWW.sabi.co.UK/blog/0706jun.html?070609#070609 Peculiar case where a remote X display using anti-aliased fonts is abnormally slow system administration X11 fonts http://www.sabi.co.uk/blog/0706jun.html?070609#070609 Sat, 09 Jun 2007 22:00:00 +0000 http://WWW.sabi.co.UK/blog/0706jun.html?070602#070602 Software RAID has a very different profile from hardware RAID, both as to performance and administration RAID system administration storage http://www.sabi.co.uk/blog/0706jun.html?070602#070602 Sat, 02 Jun 2007 22:00:00 +0000 http://WWW.sabi.co.UK/blog/0802feb.html?080205#080205 Why WinSCP by default is slow, and general performance issues of bulk data transfer over SSH and solutions or palliatives performance networking Linux MS Windows http://www.sabi.co.uk/blog/0802feb.html?080205#080205 Tue, 05 Feb 2008 21:40:00 +0000 http://WWW.sabi.co.UK/blog/0801jan.html?080122#080122 The number of NFS instances can be a surprising bottleneck, and in the past it exposed a disjointed hardware vs. software design on Sun servers. Linux performance networking system administration http://www.sabi.co.uk/blog/0801jan.html?080122#080122 Tue, 22 Jan 2008 21:05:00 +0000 http://WWW.sabi.co.UK/blog/0712dec.html?071223#071223 Discovered that a popular 1gb/s chipset can transmit but not receive jumbo frames, and how to take advantage of jumbo frames at least for transmitting. hardware networking performance Linux http://www.sabi.co.uk/blog/0712dec.html?071223#071223 Sun, 23 Dec 2007 14:50:00 +0000 http://WWW.sabi.co.UK/blog/0712dec.html?071215#071215b Two network accelerators recently announced, both offloading network processing to onboard Linux. hardware networking Linux http://www.sabi.co.uk/blog/0712dec.html?071215#071215b Sat, 15 Dec 2007 15:10:00 +0000 http://WWW.sabi.co.UK/blog/0712dec.html?071215#071215 A group test of 2.5" hard discs reported significant performance differences among supposedly very similar commodity products. hardware storage performance http://www.sabi.co.uk/blog/0712dec.html?071215#071215 Sat, 15 Dec 2007 16:25:00 +0000