Is Alphabet's Project Wing drone initiative about to fall from the sky? A report this week says the company is scaling back the project significantly. Heck, a drone-related deal with Starbucks has. If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos. OS & Tools; Platforms. In the first study to take a closer look at the future of what is being called “severe turbulence,” involving “random up-and-down motions that are.
The disk directory is the table of contents for your hard drive. Directory errors build up slowly over time – or quickly after a crash. Such errors can cause problems opening or saving files, and if severe enough they can prevent your Mac from starting up, instead displaying the flashing question mark. Fixing the disk directory and boot blocks often helps resolve these kinds of problems.
Directory Damage or Your Mac Won’t Boot
Create a Fresh New Directory
DiskWarrior is my tool of choice to fix directory related problems. You will need to restart your Macintosh from the DiskWarrior CD to fix the internal hard drive. When DiskWarrior is ready, select your startup drive and click Rebuild Directory. Replace your existing directory when the process is complete, then restart normally to see if your problem is fixed.
Repair the Damaged Directory
Other disk utilities are worth trying when DiskWarrior doesn’t help. Apple’s Disk Utility has a Repair Disk function that sometimes gets you going – you can restart from your Mac OS X Install CD/DVD and run Disk Utility to fix your startup drive.
At a more sophisticated level, TechTool Pro and Drive Genius let you test for various hardware damage and try to repair errors; both also come on a bootable CDs or DVDs.
Rebuild the Desktop (Classic Mac OS)
For Mac OS 9 and Classic users, Apple’s Rebuild Desktop routine can help fix problems opening files in Mac OS 9 applications. For Classic Users running Mac OS X, use System Preferences –> Classic –> Advanced tab to rebuild the desktop. If you’re booted in Mac OS 9, restart the Mac while holding down the Command (Apple) and Option keys (Cmd-Opt) simultaneously until you are asked if you want to Rebuild the Desktop.
Repairing File Permissions
File Permissions are security settings that permit or restrict access to files and folders by different users. This security helps prevent you from modifying special system files you shouldn’t change and prevents other users from seeing the files inside your Home folder when you share a machine. The easiest way to view or set a file’s permissions is to select the file (or folder) and choose Get Info in the Finder (File –> Get Info, or Cmd-I). The Ownership & Permissions area shows who can do what with that file.
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While noble in intent, incorrectly set file permissions can sometimes prevent you from launching applications or saving files. They can also cause problems with OS updates. Apple is aware of this and provides a way to Repair Permissions that restores defaults and fixes many problems. Use Apple’s Disk Utility, select your boot drive, then choose the First Aid tab (if necessary) and click Repair Permissions. Let the process run completely.
- Tip: Repair Permissions before and after any System Software updates for best results.
Nonvolatile Memory (PRAM)
The contents of your computer’s RAM are normally lost when you shut down, but some settings are saved when the power is off: the date and time, your network settings, choice of startup disk, etc. These settings are stored in a special type of RAM called Nonvolatile RAM (NV-RAM) or Parameter RAM (PRAM). A small battery on the motherboard powers this special RAM when the computer is turned off.
Zap the PRAM
Sometimes data in the PRAM gets corrupted, especially after a hard crash. Corrupt PRAM can prevent your Mac from booting and causes all sorts of strange errors. Resetting (or zapping) the PRAM can fix problems like these: restart your Mac, and after it chimes hold down the Command (Apple), Option, P, and R (Cmd-Opt-P-R) keys simultaneously. After a few seconds, the system will restart again and chime a second time. Now release keys the keys and boot normally.
Replace the Battery
Another problem could be that the PRAM backup battery may be dead. This is typically a 3.6V Li-ion battery that lasts about five years. If the date and time on your computer are wrong each time you unplug your Mac, it’s time to replace the battery. The battery is accessible on most tower Macs, otherwise a Mac service center can do this for you.
Other Mac Tricks
Eject a Stuck CD or DVD
To eject a stuck CD or DVD, especially with a slot loading drive, try this: Restart your Mac and hold down the mouse or trackpad button continuously until the disc ejects. The works 90% of the time.
Open Firmware
On PowerPC-based Macs you can also Boot into Open Firmware (which really impresses your friends and coworkers). Open Firmware is Mac’s BIOS and provides a few additional options for sick systems. Restart your Mac, and after the chime hold down the Command (Apple), Option, O, and F (Cmd-Opt-O-F) keys simultaneously. Eventually the system will boot to a white screen with an ok> prompt.
You can very thoroughly zap PRAM from this screen, even better than using Cmd-Opt-P-R. Type the following lines:
The system will then reboot.
You can also use Open Firmware to eject CDs/DVDs that won’t eject any other way:
Sadly, Intel-based Macs do not have Open Firmware, so equivalent tricks are still waiting to be found.
Severe Turbulence Video
Maintaining Your Mac
This article was originally published on Adam’s Oakbog website. It has been adapted and reprinted here with his permission.
Keywords: #macmaintenance #diskproblems
Short link: http://goo.gl/u6rOAl
searchword: solvediskproblems
There is a severe security issue with Mac OS X 10.2 Jaguar, which allows
any user of the system to navigate through the entire filesystem, and
possibly overwrite any file. The security issue lies within the 'NetInfo
Manager' application, which is setuid root. Whenever an user runs this
application, the entire appliation is running as root.
Therefore, if the user runs 'NetInfo Manager' and chooses to print the
window content by choosing 'Domain: Print', the Print dialog is running
as root? By choosing to 'Save as PDF', the associated file manager
window is itself running as root, thus allowing the user to navigate all
files on the connected hard disks. Moreover, by creating a filesystem
link to any file of the filesystem, calling the link 'dummy.pdf', and
then saving the PDF over this link, the user is then allowed to
overwrite the contents of any file of the filesystem, including system
files or files owned by other users on the system.
Although this security hole cannot be used to gain priviledged status
with a clean install of Jaguar, it might be possible for a malicious
user to install a custom Print Driver of his choosing, which could, for
exemple, run a copy of Terminal.app as root, thus allowing the attacker
to gain root access.
A similar security issue has already been discovered a few month ago,
where running 'NetInfo Manager' allowed any user to become root while
choosing a program from the Apple menu. Setuid applications have severe
security implications, this should not been forgotten.
Also, note that from all the programs shipped with Jaguar which are
setuid root, NetInfo Manager is the only program which does not 'drop
priviledges'.
I am hoping that a security fix will be available as soon as possible.
For the good of the community, I am not going to divulge this security
issue for a reasonable period of time or until you provide a fix or
publish a technical note about it, whichever comes first. Do not
hesitate to contact me should you need more information about this
problem,
E-Secure-IT Administrator
http://www.e-secure-it.co.nz