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What is a bad sector?

A sector is a small area on the surface of a hard drive or a floppy disk.

Hard drives usually have several platters. The platters are the discs which are covered with magnetic material which is used to hold data. Floppy disk drives contain only one platter.

Platters are divided into a set of concentric rings called tracks. A 1.44MB floppy disk has 160 tracks. Hard drives have thousands of tracks.

Each of these tracks is divided into smaller storage areas called sectors. A sector is the smallest storage area on a disk.

What is a Bad Sector?

Hard drives are contain millions of sectors. It is very normal for some of these sectors to be bad sectors, even when the drive is first manufactured.

In addition, a small number of sectors will normally go bad during the lifespan of a drive.

When this happens, the data in those sectors may be lost, but the data on the rest of the disk will be unaffected and the disk is still completely usable.

A bad sector cannot be repaired, but it can be marked as unusable. Once marked as unusable, the Operating System will know not to attempt to store data in that bad sector. The storage capacity of the disk will be decreased by the amount of storage space in the bad sector.

If your hard drive develops a bad sector, back the hard drive up immediately. If the bad sector was caused by a faulty drive head, the problem can quickly spread to other sectors on the disk.

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Puzzlotto brings a different kind of game (and a cash prize) to the App Store

Filed under: Analysis / Opinion, Gaming, Software, Odds and ends, Developer, iPhone

Puzzlotto has been about as hidden as the lemurs you can see in the screenshot over there, for some reason — the concept isn’t real easy to grasp, and if you just stumbled across the “game” in the App Store, odds are that you’d think you had $5 stolen from you. But there is a weird story hidden here, both literally and figuratively. The game itself was designed by people like Mike Lee of Delicious Monster and David Lanham of Iconfactory, but the screen you’re presented with on loading the game doesn’t seem anything like the Mac software those guys are known for — there’s just a picture of a forest, and a few eyes that you can touch to make lemurs and other creatures pop out. I would tell you more, but I haven’t actually figured it out yet — there’s a “fosa” that will scare away any lemurs or butterflies you’ve summoned, and I know that the butterflies are basically a progress meter, but other than that I have no idea.

But Puzzlotto isn’t just that perplexing app — it’s been dubbed “fundware” by Lee, and 10% of the proceeds from the game will go to the Madagascar Fauna Group to support the habitats of lemurs, fosas, and butterflies. And it’s actually a puzzle to be solved, with a cash prize — if you can be the first to figure out the “puzzle” behind Puzzlotto, United Lemur will give you a cash prize out of their prize pool, currently at $5000, and growing every day for 31 days. If no one claims the prize at the end of the 30 days, all the money will go to charity, project over. You can follow updates on their Twitter — it sounds like no one’s claimed any prizes yet, which is no surprise — if there are any clues in the app, they’re very, very hard to find. United Lemur claims that there is a game in there (and that it is worth the $5 entry fee), but so far, all players have found is a few screens of the weird lemur puzzle.

But it is a different kind of game — a cash prize handed out by a flabbergastingly tough puzzle disguised as an App Store game, all designed to benefit a charity. Lee says on his blog that they wanted to make a game where players couldn’t cheat by telling each other the answer, but maybe they didn’t realize that part of the fun of Myst is sharing the strategy with other players. And if you don’t want to shell out the $5 on Lee’s word, it might be fun to just wait until the solution gets posted somewhere anyway. Have you solved any part of Puzzlotto yet?

Puzzlotto brings a different kind of game (and a cash prize) to the App Store originally appeared on The Unofficial Apple Weblog (TUAW) on Mon, 27 Oct 2008 20:00:00 EST. Please see our terms for use of feeds.

Puzzlotto brings a different kind of game (and a cash prize) to the App Store originally appeared on The Unofficial Apple Weblog (TUAW) on Mon, 27 Oct 2008 20:00:00 EST. Please see our terms for use of feeds.

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Box.net iPhone

I love Box.net — the online file storage system that makes it easy to store and share files with other users quickly and easily. A couple of years ago, TUAW wrote up how to use Box.net as an iDisk (and this still works), but now the Box team has made it even easier to access your files while on the go, with the new Box.net iPhone app.

The app, which is compatible with the iPhone and the second generation iPod Touch (sorry 1st Gen touch users!), is simply awesome. Box.net already had an iPhone friendly mobile interface at i.box.net, but while you could access some files from that page, you couldn’t play back media and document viewing was more limited. The new application means you can play back audio and video (assuming the file is compatible with the iPhone 2.1’s firmware support for QuickTime), view PDF or Office files, view photos, and upload photos from your iPhone or iPod Touch directly to Box.net.

Even nicer, the Box.net app integrates directly with your address book, so you can share a folder or individual document with a contact, just by clicking the “Share” button and selecting the contact from the address book. The application also notifies you of any updates or changes made to your box, which is great for individuals who collaborate with other users using a Box.net account.

I have a free Box.net account (which limits me to 1 GB of storage space and puts a 25 MB cap on file sizes), but I was able to access all my files and documents with ease. On my iPod Touch, Box.net loaded PDF files faster than some other tools I have used for PDF viewing, though I did find that network activity did impact overall speed. When the bridged router I use with my non-802.11n devices was in heavy use, it could take quite some time to load a large PDF. When the G router was idle, load time was almost non-existent, even for 8 or 9 MB files.

I don’t have an iPhone, so I cannot vouch for EDGE or 3G speeds — but over WiFi, speed was solid.

The interface of this app, as you can see from the gallery, is just superb. It perfectly matches both the Box.net website and the iPhone user interface guidelines. Maneuvering through files was a cinch and I love the integration with the address book for sharing files or folders. Being able to upload photos directly to Box.net is also pretty great.

If there was anything that could be on my wishlist, it would be the ability to upload other types of tiles to Box.net as well. Of course, you can always e-mail uploads to Box.net, so this isn’t an absolute necessity.

Box.net is free and available from the App Store now.

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Google Earth for iPhone

Google has ported Google Earth to the iPhone or iPod touch, and it’s such an impressive app that it deserves an Apple ad of its own.

The interface for Google Earth will be familiar instantly to anyone who has used an iPhone for more than a couple of hours. Upon launching the app, you see a photo of the Earth from space. To zoom in, you can either double-tap or use the “reverse-pinch” gesture on the screen. Swiping a finger left, right, up, or down moves the display in the chosen direction, and a two-finger rotation turns the display clockwise or counter-clockwise. There are icons on the display (see screenshot at right) for search, using your current location, changing settings, and realigning the display to North.

Things get more interesting when you tilt your iPhone; the display goes from a flat, satellite-eye view to a 3D-like image. If you’re near mountainous terrain, you get a true sense of the topographical features of the land. On many screens you’ll see Wikipedia icons, which link you to related Wikipedia articles.

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