macOS may lose data on APFS-formatted disk images | Carbon Copy Cloner | Bombich Software
How much does Carbon Copy Cloner cost and how can I purchase it? classes of applications that do not meet the policy requirements imposed by Apple. I spent the first 25 years of my life barely making ends meet without knowing how . There are tons of people who's met success with Carbon Copy PRO that can. Purchasing an Upgrade for Carbon Copy Cloner 5 but there are certain classes of applications that do not meet the policy requirements imposed by Apple.
You could say that these lessons, even though costly and painful, where well worth their toll.
It was like graduating from the school of hard knocks with a degree in gorilla marketing. Then one day when I was at work, hating my job, and pissed off at the world, I stumbled across a website.
This website talked about this guy who was making bucks a day from home in some online marketing opportunity. I filled out a form on his website and waited 3 days for him to call me back. I quickly realized that yet again I was on my own. I was going to have to figure it all out myself or fail. Once again I felt like I was being thrown to the wolves… I was embarrassed and pissed off.
I had borrowed it and had to pay it back in full so failure was NOT an option.
I channeled my anger, confusion, and frustration. I decided to suck it up and figure it out. I gave it everything I had and was able to put my 3 years of experience and trial-and-error to use. I finally got something to stick. Slowly but surely I started to build some momentum and within a few weeks I made back my money. Then, within days of figuring out a few more marketing secrets, I started making some real money.
I was actually making more at home part time than I was bringing home from my job. So, I went into work one day and fired my boss.
Talk about an empowering feeling. You can actually read my resignation letter in the next chapter.
macOS may lose data on APFS-formatted disk images
I remember driving home that day with the most liberated feeling imaginable. It felt like a long awaited vacation had finally come, but this time it was permanent! I was on a mission to prove to all of my friends and family members that I was NOT the crazy one!
I was able to pay off and get rid of my credit cards along with a lot of other bills that had piled up over the years. You should have seen the heads beginning to turn! I gave my old VW to a family member and bought two brand new cars, one of them was a custom built BMW! I changed my focus to helping others create what I had created and the rest is history. I was not born with a silver spoon in my mouth and almost everything I know is self-taught.
I learned the hard way, on my own, and for the most part without any help or support from my supposed mentors. Back inI recruited this guy with a funky Australian accent named Alan Moore.
He was a brilliant marketer and we instantly hit off, becoming great friends. We worked on a lot of marketing stuff together and we VERY quickly mastered Google along with all the other search engines. We both started making a lot of money but we never forgot about our members. In fact everything that we figured out, we posted on our website for everyone to use.
Carbon Copy Pro | Carbon Copy Pro Review, Pro U Review | Brian Magnosi
If you've ever lost data, you know the kick-in-the-gut feeling that would have ensued. Thankfully, I was just running some tests and the file that disappeared was just test data. Taking a closer look, I discovered two bugs in macOS's "diskimages-helper" service that lead to this result. So for example, if you had created a disk image with a capacity of GB on a GB network volume, but then you added GB of stuff to the network volume outside of the disk image, now there's only GB of space for stuff on the disk image.
Accordingly, when you mount the disk image, it would report its own disk usage as GB and its free space as GB even if there is literally nothing on the disk image volume. The math always felt weird, but the result was right — the disk image can't practically accommodate more than GB of data, so the free space should reflect that. This behavior is documented in Apple's hdiutil man page: This behavior has been a known quantity for many, many years.
If this were the only bug, however, this issue would be just an annoyance.
- Mac Backup Software
- Carbon Copy Pro?
The larger issue occurs when any application tries to write more data to the disk image volume than the underlying disk can accommodate. The diskimages-helper application doesn't report errors when write requests fail to grow the disk image The diskimages-helper application works quietly in the background, responding to filesystem requests made to the disk image volume.
It's essentially a broker, or middle-man. There's a disk image file on disk, but applications don't interact directly with the file, they need to interact with a filesystem. So the diskimages-helper application presents a filesystem interface on top of that disk image file.
When you make a write request to a mounted disk image volume, the request goes to the diskimages-helper application, which translates that request into changes to the disk image file. When you initially create a "sparse" disk image file, that file is very small, e.
It's just large enough to hold some pre-allocated space for the filesystem structures. As you copy files to the disk image volume, the file grows.
Herein lies the bug.
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Following the earlier example, suppose you attempt to copy GB of data to that GB disk image file. This shouldn't be possible, because there was only GB of free space left on the underlying disk. The first GB of data does successfully get written into the disk image file — the disk image file has grown now to GB.
But now the underlying disk is completely full, and the disk image file can no longer grow — the diskimages-helper application is getting "No space left on device" errors when trying to write data to its band files. At this point, you'd think that the diskimages-helper application would do one of the following: Report a "No space left on device" error to the process making the write request Refuse additional write requests — sorry, no more space Unmount the disk image — we have to stop this insanity Quit — please, just stop pretending to do something that you're not actually doing!
Alas, none of those things happen and no, it should never panic the kernel, but writing to the void is equally unreasonable. The final illusion After files failed to actually make it to a physical disk somewhere, you'd think hope? This is probably the most alarming part of this bug — because the filesystem structures are stored on a section of pre-allocated space on the underlying disk, the diskimages-helper application has no trouble updating filesystem metadata.
So file size, modification date, permissions, etc — all of those attributes are fine. In yet another bizarre twist, we found that many times a truncated file would even validate a checksum test. Presumably the diskimages-helper retains some of the file data in RAM, because again, the data never made it to the underlying disk. This part is perhaps the hardest to explain in text, so I created a video to demonstrate the problem: Proactively avoiding data loss CCC creates and uses disk images when you select "New disk image Starting in CCC 5.
Today we're posting an update to CCC 5.