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With the display folded flat against the base, it can serve as a Windows 8.1 tablet. With it folded almost all the way back, it can be used in "stand" mode, with the keyboard planted face down on the desk. And you can flip it around and prop it up in "tent" mode – ideal for cramped spaces.The ThinkPad Yoga isn't simply a me-too design. A number of key differences separate it from consumer-focused devices such as the recent IdeaPad Yoga 2 Pro. The most ingenious is the "lift-and-lock" keyboard. We aren't fond of the name, but we love what it does: as you push the screen back into tablet or stand mode, the plastic plate surrounding the keys rises until it's flush with the tops of the keys, while another mechanism locks the keys so they don't depress.Lenovo ThinkPad Yoga This may sound like a gimmick, but it makes the device feel more like a bona fide tablet than previous Yogas: when you grip it, there are no disconcertingly squishy keys on the rear. There's also less likelihood of damage to the keys from catching on the seam of a pocket, for example. It's just a shame that it's such a lump: at 1.6kg, tablet mode isn't particularly comfortable unless you rest it on something.

Another difference is the pressure-sensitive passive stylus, which stows away in the front-right corner of the wristrest when not in use. It's a boon for creative tasks, such as digital painting and photo editing, and it adds the possibility of using Windows 8.1's excellent handwriting recognition to your text-entry toolbox.Alas, stylus support isn't standard across the full ThinkPad Yoga Range: it's included in our upper-end review model, and the Core i3 model just below it, but the two cheaper configurations, priced at £780 and £930 respectively, support finger-touch only.One updated feature is the touchpad: instead of hinging from the top as before, the whole surface of the pad now depresses with a solid thunk. This has its advantages: trackpoint users no longer need a second set of buttons just below the keyboard, since it's now possible to simply click the top edge of the pad. It also means the pad can be larger, making multi-finger gestures easier to perform.We're not entirely convinced by the implementation, though. It's heavily sprung, which isn't a problem in casual use, but with jobs that involve a lot of clicking around – updating a website CMS, for instance, or photo editing – you're going to get tired fingers very quickly. If you choose to tap rather than click, the whole pad rattles slightly.

Google has added the HP Chromebook 11 to its lineup of budget PCs running Chrome OS, starting at £229 in the UK.The £229 price tag buys you a Wi-Fi model, and the specs mention 3G and 4G models, but HP hasn't announced pricing or availability for these.The Chromebook 11 comes with an 11.6in IPS display with 1,366 x 768 resolution. It packs a Samsung Exonys ARM chip and 2GB of DDR3 RAM, and claimed battery life is around six hours.Unusually for a Chromebook, the device can be charged via its micro-USB port, which could be handy for sharing chargers with other Android smartphones or tablets.The Chromebook 11 has a 16GB SSD and 100GB of free Google Drive storage for two years, as with the 14in model. Google's throwing in a a free subscription to its music streaming service on top, though only for 60 days.There's also a VGA webcam, two USB 2 ports and a micro-SIM slot on the 3G/4G models. Connectivity options include dual-band Wi-Fi and Bluetooth 4.The laptop weighs just over 1kg and features what HP describes as a lightweight, sturdy metal chassis, although the casing itself is plastic.

The new PC will be available from Currys, PC World and other retailers by the end of October, HP said.This is HP's second attempt at a Chromebook laptop, after the firm unveiled its Pavilion 14 Chromebook in February starting at $330 in the US and £250 in the UK. That makes the new model only marginally cheaper, although it's already possible to buy the 14in model for the same price from some UK retailers.It’s hard not to run into Big Data when running any kind of network these days. Either you’re scared by the prospect of having to support it, or you’re drowning in it from your own devices.According to HP – in a presentation during their Discover conference – Big Data is far more about machine-generated records (HP especially likes smartphones, which should satisfy the most paranoid reader) than it is about well-behaved, cleanly expressed corporate data stores and records.Before you start to write me that disgusted email, no, this isn’t a stealthy way of converting my Networks column into a Database column. It’s merely a sober appraisal of what we can expect to be hit by as the Big Data juggernaut revs up to full speed – along with some neat experiments you can perform before the tsunami actually hits the beach (to thoroughly mix the metaphor).

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Big Data is far more about machine-generated records than it is about well-behaved, cleanly expressed corporate data stores and recordsBig Data is far more about machine-generated records than it is about well-behaved, cleanly expressed corporate data stores and recordsThis way, you’ll at least be familiar with the basic ideas once the buzzwords start flying thick and fast.Thinking up appropriate experiments is an ingrained habit for me, a product of the moderately far-off days of my economics course. Almost all economists start off their case studies from the assumption that “you have £100”, in order to make the effect of this or that market force as clear as possible.In networks, especially when it comes to managing internet access and monitoring a firewall, there’s no simple equivalent to this £100 case study. There’s no handy site named “www.thisisnotpornreally.com” that nonetheless trips the content filter on your unified security device.Setting up to record Big Data from all the website accesses that pass through your firewall is a baptism of fire, a fat hosepipe of data that gushes relentlessly into whatever unfortunate syslog server and repository you have managed to cobble together.

Incidentally, before I go any further with this simple example, please note that when mega-corporations talk about this vast and unending recording of the sum of human activity through their phone networks and web-surfing stats, they’re usually talking about syslog formatted files.Syslog has become the ubiquitous logging format, one of those quietly maintained open formats that everyone finds it in their interest to use, as both generators and analysers of log data from an Internet of Things.So my little example really does scale, in all likelihood, right up to NSA level, and can give you a peek into just what they might be able – and might not be able – to do using basic, known tools and techniques.Anyway, back to the simple example setup.My suggested scenario requires a set of parts and a policy decision to really work – although of course, if you’re trying this on your own home network, the policy decision meeting will be pleasingly short.You’ll need a firewall or router that can emit syslog (most of them do, although it may take a bit of digging to find the right config setting and establish that it’s actually running).

Then you need a syslog server, which is a fairly simple and lightweight utility program that mercifully hasn’t yet been seized upon by the griefware developers.No matter how careful you are, accidents happen. If you work with computers, it's almost inevitable that sooner or later you'll end up inadvertently deleting an important file, or losing data due to a hardware failure.Naturally, your first line of defence is a strong backup regime. For businesses in particular, it's crucial to keep at least one copy of everything. For some types of data, it's a legal requirement.In the real world, however, things do slip through the cracks, and that's where the data-recovery experts come in: companies that specialise in rescuing unreadable data, even if the disk has been wiped or physically damaged.Who uses data-recovery services?Data recovery is big business, but you don't have to be a large organisation to make use of such services. "Home users, small organisations, large multinationals – you name it, we've done it," declares Phil Bridge, MD of Kroll Ontrack, a company specialising in data recovery."We get a variety," agrees Grant Woods of LC Technology, an agency specialising in flash media recovery. "We get Joe Bloggs round the corner, and we get a lot of corporate companies. Probably our main source of custom is professional photographers, who come to us when a card's corrupted and they can't reproduce the data – for example, from a wedding.

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"We're also starting to do a lot for TV companies now. We've had a cameraman who hand-delivered a card: he'd been on location in Syria, obviously being shot at every now and again, and he had a corrupted card. We recover these things, and then a week later it's been edited and it's on TV. That's very satisfying."Data recovery isn't only about corruption. Sometimes customers need help restoring data from legacy media they can no longer read themselves."They'll have a big tape library," explains Bridge, "and they'll say ‘we don't have the hardware to read it, we don't know what software was used'. They'll send a big crate of media to us, so when they need to produce data we can get that off for them. It's a pretty big business, tape, and one that I think is growing."To serve this business, Kroll Ontrack maintains a collection of legacy drives – and it isn't only tape that's covered. "We can read pretty much everything," claims senior engineer Robin England. "We can recover old floppy disks, both hard- and soft-sectored. We're quite stringent in maintaining a lot of old 3in drives, and even the 2in floppy disks used by Zenith laptops. If you came to us with a ZX Microdrive cartridge, we'd dive on eBay and see what we could do. It may require some R&D work, but I'm sure we could come up with a solution to read the tape. Bring us a punched card and… well, it depends on the encoding. And how much you've got of it."

At the other extreme, modern storage methods that spread files across multiple physical and virtual volumes present a different sort of challenge."Enterprise SAN systems use dynamic mapping," explains recovery specialist Richard Holbrook. "We first have to work out how the low-level RAID array is set up, then figure out the dynamic mappings. Then there might be another RAID level, then a virtual system on top of that. It's layers upon layers upon layers. Recovering data can take weeks or months if the damage is quite severe, and the cost can run into tens of thousands for larger systems."Regardless of the job, and even the media type, the recovery process is broadly the same. Before touching the media, the first step is to work out the legal status of the data in question: "If there's any hint of a legal process behind the request for discovery or extraction, we pass it to our legal specialists," says Bridge. "We have to follow a chain of custody, and the data may need to be presented in a way that's legally defensible."As far as advertising spend goes, the Acer Aspire C720 has received more than its fair share since its launch. It’s been everywhere: on billboards, newspapers and magazines – yet it’s as unlikely a poster child as you’ll ever come across. See also: what's the best laptop you can buy in 2014?

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