The Status Indicator Light (SIL) on Mac mini and Mac Pro has different patterns based on the state of your Mac. These patterns also occur on some MacBook, MacBook Pro, MacBook Air, and iMac models, though not all Macs have a SIL. If you have a Mac Pro, learn about the status indicator light behavior on Mac Pro (2019).
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After you press the power button
Applications written with Carbon were initially able to run natively on both classic Mac OS and Mac OS X, although this ability was later dropped as Mac OS X developed. Carbon was not included in the first product sold as Mac OS X: the little-used original release of Mac OS X Server 1.0, which also did not include the Aqua interface. I want to set the don't fragment flag on IP. Darklin wars (demo) mac os. On a socket this is what I want to do: int val = 1; setsockopt(sd, IPPROTOIP, IPDONTFRAG, &val, sizeof(val)); However IPDONTFRAG does not seem available on Mac OS. Am I missing something? Or did I forget to include it correctly? Thanks in advance if anyone knows.
Every time you turn on your Mac, it performs various hardware checks. If the SIL flashes one or more times after you turn on the computer, and the pattern repeats after a brief pause, there may be a hardware issue. To isolate the issue, run Apple Diagnostics.
During startup
When you press the power button to turn on the computer, the SIL also turns on. As the computer starts up, the SIL stays on until the processor (GPU) has initialized and the display turns on. When the GPU initializes properly, the display turns on and the SIL turns off simultaneously.
On Mac mini models from 2011 and newer, the SIL stays on when the computer is powered on.
During operation or display sleep
While the computer is operating, the SIL remains off. If the display turns off but the computer is still on, the SIL turns on and does not blink. It remains like this until the display turns back on, at which time the SIL turns off again.
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On Mac mini models from 2011 and newer, the SIL remains on when the computer is operating.
You can turn on Display Sleep by pressing Control-Shift-Eject. To change your Display Sleep settings, drag the 'Turn display off after' slider in the Energy Saver or Battery pane of System Preferences.
During sleep
When your Mac sleeps, the SIL pulsates on and off slowly. On Mac mini models introduced in 2018 or later, the SIL stays on when the computer is in sleep. You can customize your Mac's sleep behavior in the Energy Saver or Battery pane of System Preferences.
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On Mac notebook computers, if the battery is completely depleted and the computer goes into Safe Sleep, the SIL doesn't illuminate at all.
During shut down
When you choose the Shut Down command, macOS first turns off the GPU. This turns the display off. When the display turns off, the SIL turns on. During the few seconds of shutdown, but before power is removed from the main logic board, the SIL remains on and will not blink.
When the computer is fully shut down, the SIL turns off.
Firmware recovery mode
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If Mac mini (M1, 2020) is in firmware recovery mode, the status indicator light rapidly flashes amber three times, briefly flashes amber three times, then rapidly flashes amber three times. This repeats until the computer is turned off. You might need to revive your Mac mini. If you still need help, contact an Apple Authorized Service Provider.
Q Others used to advise periodically defragmenting files on your startup drive, and you used to recommend defragmenting its free disk space. Do these still apply to El Capitan, and if so, how should I do them?
A These are traditional housekeeping measures which were once considered to be very important to optimise performance in OS X and its applications.
The theory behind defragmenting files is that reading from hard drives is quickest when the drive does not have to keep chasing fragments of the file which have become scattered to different parts of the drive. The theory behind defragmenting free space is to ensure that OS X and applications can obtain contiguous areas of free disk space for their scratch and working files, again to improve their speed of access.
Frost (itch) (ape in the tree) mac os. These have become progressively less important as OS X has become better at performing its own background housekeeping to minimise the fragmentation of files, and as SSDs have become more widely used. You should never attempt to defragment files or free space on an SSD: that would be pointless, and would shorten its working life.
If you use an SSD as your startup drive, or have a Fusion Drive, you definitely need not worry about file or free space fragmentation.
If you still start up from a normal hard drive, then there might be some benefits in periodic defragmentation. But it is more important to keep ample free space, so that OS X can do its housekeeping, and obtain the scratch file space it needs.
The other side to this is that El Capitan is not as easy to defragment either. There are still some file defragmentation tools, but I would be wary of using them at present. The old trick of cloning your startup drive to an external disk, and cloning it back to the startup drive, is now fraught, and could leave you with a system which cannot boot from either drive. This is because of the way that the Recovery partition is implemented, and gets to be more of a problem if you are using a Fusion Drive.
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So for the moment, probably with Yosemite and certainly with El Capitan, you should keep ample drive space free, but not worry about defragmenting either files or free space. That should keep life simple, reliable, and stress-free.
