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Extend Mac OS X's Screenshots

Mac OS X has a variety of built in screenshot methods. Here's a look at a few that offer more versatility than the basic full-screen capture (Command-Shift-3):

• Press Command-Shift-4 and you'll get a crosshair cursor with which you can drag to select and capture a certain area of the screen.

• Press Command-Shift-4-Space to select the entire window that the cursor is over, clicking on the window will then capture it. The resulting screenshot will even get a nice drop shadow.

• Hold down the Space bar after dragging out a selection window to move your selection rectangle around on the screen.

• Hold down Shift after dragging out a selection to constrain the selection in either horizontal or vertical orientation, depending on the direction of your drag.

• Hold down Option after dragging out a selection to expand the selection window around a center point.

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No Correlation Between Heat and Hard Drive Failure

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The folks at online backup service Backblaze have once again taken a statistical look at their hard drives to find out if they’re affected by temperature.

The results seem to counter our general recommendation to give hard drives plenty of ventilation room in “The Care and Feeding of External Hard Drives” (28 April 2014). Overall, Backblaze found no correlation between heat and failure rates, with one exception: the Seagate Barracuda 1.5 TB drives, which failed slightly more often when run at higher operating temperatures. But the Hitachi drives surveyed actually failed a bit more frequently at cooler temperatures. It’s worth noting that the drives experienced average temperatures between 22° and 30° Celsius, well below the 55° to 60° maximum operating temperature recommended by drive manufacturers.

In any case, it’s still important to run drives within their specified operating temperatures, which means giving them sufficient ventilation. As long as you don’t block cooling vents or put them in insanely hot environments, they should not be adversely affected.


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Comments about No Correlation Between Heat and Hard Drive Failure
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Anonymous  An apple icon for a TidBITS Angel 2014-05-19 16:58
Where are they measuring temperature? These don't appear to be SMART sensor numbers as they are much too low.

For example, my Hitachi SMART reading is 38C inside an xServe with avg inlet temps of 22 and an internal ambient of 30. (Inside a server room at 21.)

The article graphs the Hitachi from 21 to 31 which suggests they are using internal ambient or something else external to the drive.

I realize SMART stats have their drawbacks but I would think that the temp would be more useful if trying to find direct correlations regarding temp.

Adam Engst  An apple icon for a TidBITS Staffer 2014-05-20 06:33
They seem to be measuring ambient air temperature in their drive pods, which would likely be lower than the SMART-reported temperature within the drive itself.