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.
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Directory Damage or Your Mac Won't Boot
Create a Fresh New Directory
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- When SSDs are safer to jerks and small turbulence, the HDDs are quite sensitive, a small jerk to your computer may cause severe damage to your hard drive. Sudden Switching – A sudden and frequent switching of computer may cause a large damage to functionality of the hard drive. This is recommended always by the manufacturer.
- To predictive turbulence modelling were developed in the recent y ears by Duraisamy and co-work ers (T racey et al., 2013, 2015; Parish and Duraisamy, 2016), by Ling and co-workers (Ling et al.
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. https://strategy-better-card-jacks-shift-bonus-or-ny.peatix.com. 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.
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.
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.
Severe Turbulence Mac Os Catalina
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
Severe Turbulence Mac Os X
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. Magic world on line. 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.
Clothes the window mac os. 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.
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
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Digitized Theses
Title
Author
Date of Award
1996
Degree Type
Dissertation
Degree Name
Doctor of Philosophy
Abstract
The behaviour of transmission lines under severe winds is examined.;Firstly, the effect of scale of turbulence on the response of a line-like structure (cable model) is investigated through wind tunnel tests, and the experimental results are successfully compared with theoretical predictions made through the statistical method using influence lines. Consistency with theory allows for the development of a new modelling approach to conductor systems using a distorted horizontal (spanwise) scale to accommodate these systems in the wind tunnel. Cables with different characteristics are simulated and tested at transverse and oblique wind incidences.;The model cables are successful in reproducing full-scale behaviour of transmission lines. The results obtained demonstrate the effect of turbulence in the dynamic response. Resonant response can be important in the total response depending on the characteristics of the structure and of the wind flow. Aerodynamic damping plays an important role in the dynamic behaviour of the cables. Correlation and coherence between cable forces were found to diminish with increasing separation between cables.;Secondly, using a theoretical approach, the design procedure for the establishment of wind loading on transmission towers is reviewed and current procedures, such as Davenport's Gust Response Factor (GRF), are compared with the statistical method using influence lines (SIL), which is considered more realistic.;Peak loads calculated using SIL were larger than peak loads given by the GRF and by a typical Utility Company method by about 20% to 30%. It is found that the dynamic response of transmission structures is strongly dependent on the turbulence intensity level and is sensitive to the structures' design parameters. For members in which there is reversal in the member forces depending on the load position, the resonant response in the second mode of vibration was bigger, even by four to five times, than the corresponding one in the first mode. This may lead to fatigue problems.
Recommended Citation
Loredo, Souza Acir, 'The Behaviour Of Transmission Lines Under High Winds' (1996). Digitized Theses. 2650.
https://ir.lib.uwo.ca/digitizedtheses/2650
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