Troubleshooting

Insignificant bug keeps encrypted disks unlocked after ejecting in OS X

Apple's CoreStorage disk encryption technology has a small bug that will keep a disk unlocked, even after it has been ejected from the system.

In OS X Lion, Apple introduced a drive management technology called CoreStorage. When enabled, CoreStorage will create a "logical volume group" out of one or more physical drive partitions, and then create usable "logical volumes" from this group to serve as storage for your system. This setup allows the logical volume to span multiple physical partitions (as is seen with Apple's Fusion Drive), and support features like encryption for Apple'… Read more

Options for secure file removal in the OS X Terminal

While deleting files in OS X simply involves moving them to the trash and emptying it, this routine does not remove the data of these items, but instead only clears the directory entry for them. The content of the items is kept on disk with the system having no way to access it; as a result, there is potential for the content to be scanned and recovered by data recovery tools.

To prevent this from happening, you can use secure-erase features in OS X, one of which is to securely delete the files in the Finder by choosing this option … Read more

How to manually enable NTFS read and write in OS X

OS X supports the option to read NTFS-formatted drives, but has not supported writing to these drives. Therefore, the use of a third-party driver such as Paragon NTFS or Tuxera NTFS has been required for those seeking full NTFS support; however, OS X does support writing to NTFS, but this feature is just not enabled by default.

To enable this feature, you have to do so on a per-volume basis, by editing the system's hidden fstab file to adjust the way the drive is automatically handled when attached and mounted.

First ensure that your NTFS drive has a simple … Read more

Q&A: MacFixIt Answers

MacFixIt Answers is a feature in which I answer Mac-related questions e-mailed in by our readers.

This week, readers asked about the necessity of running regular permissions fix routines, how to prevent Time Machine from backing up over VPN, and resizing PDF files in QuickLook.

I welcome contributions from readers, so if you have any suggestions or alternative approaches to these problems, please post them in the comments!

Question: The necessity and utility of running regular permissions fix routines MacFixIt reader Jim asks:

I was taught it was a good idea to occasionally do a "repair permission" periodically, … Read more

Prevent resume from occurring at application launch

Apple's autosave and resume features are convenient for maintaining your workflow, even when you do not save documents. So in a program like Pages, for example, you could work on a document and simply quit the program or restart your computer, and the next time the program opens, your documents will be reopened with the changes to them preserved.

While convenient, especially in the event of a crash, hang, or power outage, this feature does have one potential drawback: it could reveal some personal or otherwise private information at inopportune times.

You can avoid this by quitting programs with … Read more

How to change the icon for multiple items in OS X

The generic icons that Apple and third-party developers provide for files and folders are usually enough to help you identify file types in OS X, but there are times when you might want to use a different representation. One option that Apple offers is the ability to show file previews as icons, but this is only available for some file types and not for others.

An alternative option is to add custom icons to files and folders, which can be a fun and useful way to give your system a unique look. To do this, simply select an item and … Read more

Tackle problems installing 10.8.4

Yesterday Apple released the OS X 10.8.4 update for Mac users, which brings a number of fixes for network connectivity, VoiceOver, Boot Camp, and online services like FaceTime and Exchange.

While the update has been relatively smooth so far, a few people are experiencing problems in which the update does not properly install. In some cases the update will download and then give an error when running; in other instances the update will appear to work properly but then the system will reboot to OS X 10.8.3.

If you experience these or similar problems when attempting … Read more

Time Machine corruption bug may prevent backups

A bug apparently exists in Apple's Time Machine backup routines in Mountain Lion that can prevent recent backups from being used for a full restore.

By default, Time Machine mirrors the entire boot drive of an OS X system, and should update on an hourly basis to keep the backups current with changes to your system. By combining hard links to old backups along with new backup data, it quickly creates a full representation of your system by copying only changed files to the backup.

In this sense, in its default configuration each backup represented in Time Machine should … Read more

New proof-of-concept malware demonstrates virus for OS X

Security researchers have found a proof-of-concept attack that appears to be the first true viral malware approach for compromising OS X.

The malware is called "Clampzok.A" and is a cross-platform malware package that alters the binary files on an affected system so when executed, the binary will infect neighboring binary files.

The malware is written in assembly code, and was originally released in 2006 for Windows and Linux systems, but was recently updated to affect 32-bit Mach-O binary files in OS X machines.

Unlike Trojan horses, spyware, and adware that hide in one location on the system … Read more