Apple Sparse Disk Image Media

https://tunesdatnow.weebly.com/how-to-play-poker-machine.html. The Software Library contains software disk images that can be downloaded and used to re-create the floppy disks using DiskMaker 8 or any other utility which supports the compressed format. All of the download files are in ZIP disk format for universality of downloading. MacDrive 10 Pro gives you the power of Mac RAID on your Windows PC. With MacDrive 10 Pro, you can access Apple formatted RAID disks as well as RAID sets created with SoftRAID. You can also securely delete files and folders from your disk and easily create ISO images and mount sparse images.

1. Apple Sparse Disk Image Media Markt
2. Apple Sparse Disk Image Media Player

In the latest releases of both my ebooks on backups ('Take Control of Mac OS X Backups' and 'Take Control of Easy Backups in Leopard'), I include sidebars titled '(Sparse) Bundles of Joy,' in which I describe Leopard's new sparse bundle disk image format, used by Time Machine for network backups. Because this format is quite interesting, has potentially broad application, and hasn't received much attention, I'd like to say a bit more about it here.

Managing Your Image — By way of review, a disk image is a special file that can also behave like a disk – that is, if you double-click the image, a new volume appears in the Finder; this volume can contain any number of files and folders, and you can open or copy them just as you would do with the contents of any other volume. Disk images typically have the extension .dmg and are often used to distribute software. Unlike ordinary folders, disk images can be compressed, encrypted, and/or made read-only, and can be opened on any Mac, all without the use of any third-party software. If you want to distribute a whole set of files and be sure that they remain perfectly intact on the other end, using a disk imageis an excellent way to do so.

Over the years, Apple has created a variety of different formats for disk images. The sparse image (extension .sparseimage), for example, was an improvement over the .dmg format in that it could grow automatically in size as needed (up to a preset maximum). Prior to Leopard, Mac OS X used sparse images for things like local copies of your iDisk (if you have iDisk Sync turned on in the MobileMe pane of System Preferences) and FileVault (which used an encrypted sparse image). Samsung data cable connect to pc software. In both cases, the images could begin relatively small, rather than occupying lots of unused space on your disk even when they contained little data.

But sparse images, like .dmg images, had a problem. Making any change to their contents marked the entire image file as changed. If you were doing incremental backups that included a large disk image file, say, this meant that even the tiniest change would result in the entire file having to be backed up again. Apple quick keys. For example, I used to store private documents on a 10 GB encrypted .dmg disk image. But I couldn't back up the disk image file itself, because it changed every day and I'd rapidly run out of disk space if I kept backing it up. So instead, I had to separately back up the contents of the mounted image to an encrypted archive, which was an inconvenience.

Bundle Up — When I upgraded to Mac OS X 10.5 Leopard the first time, one thing I noticed immediately was that a copy of my local iDisk sparse disk image was sitting on my Desktop, while a new disk image, this time with the extension .sparsebundle, was stored in a subfolder of ~/Library/FileSync. Apple root vulnerability. Leopard had taken the liberty of converting my iDisk image to a new format – a sparse bundle – and put the old one on my Desktop as a backup, presumably in case anything had gone wrong during the conversion. So what's with the new format and why should you care?

A sparse bundle looks and acts just like a sparse image – it can grow in size, can optionally be compressed or encrypted, and so on. Keno play free. What's different is that it isn't actually a single file, as all previous disk image formats were. It's a bundle (also known as a package) – a folder that Mac OS X treats as a single file, which is also true of applications. (To verify this, you can Control-click or right-click a sparse bundle, choose Show Package Contents from the pop-up menu, and browse through its contents.) Inside that package is a folder full of bands – files that are each 8 MB in size, as many as are needed to hold the image's data.

What's cool about this is that if you change something on a sparse bundle (adding or modifying a file, for instance), only the band(s) containing that data change, not the whole bundle. As a result, assuming your backup software treats the contents of bundles as individual files, you no longer have to back up a huge disk image just because a tiny file changed. Your backup software only has to copy the 8 MB band(s) containing any of that file's data (often only one). So I converted my encrypted sparse image to an encrypted sparse bundle, and now I can include it along with all my other files in my ordinary backups.

Nuts and Bolts — You can create and modify disk image files (of whichever sort) using Disk Utility, located in /Applications/Utilities, or with the command-line tool diskutil if you're so inclined. For example, to create a new, encrypted sparse bundle, you'd follow these steps:

1. In Disk Utility, choose File > New > Blank Disk Image.
2. Fill in the filename, location, volume name, and maximum size; leave the format as Mac OS Extended (Journaled).
3. Choose either 128-bit or 256-bit AES encryption from the Encryption pop-up menu. Leave Partitions set as it is.
4. From the Image Format pop-up menu, choose Sparse Bundle Disk Image.
5. Click Create. Enter and verify a password and click OK.

Although Disk Utility can also convert one format to another (using the Images > Convert command), I've had some trouble with this method, and I've generally found it more reliable to create a new image from scratch and copy the contents of the old image manually.

The Future of Sparse Bundles — As I mentioned earlier, Time Machine stores your backups in sparse bundles when you're backing up over a network (to another Mac running Leopard, or to a Time Capsule). The Leopard version of FileVault also uses the sparse bundle format now, which may decrease its susceptibility to disk errors. (I'm still no fan of FileVault, though, because apart from the threat of losing data to file corruption, I prefer much greater control over what is, and isn't, encrypted.) But what I find most exciting about sparse bundles is the problems they could potentially solve, if more developers used them.

Let's go back to the problem of backing up huge files that change frequently. If you use Parallels Desktop or VMware Fusion to run Windows on your Mac, this is still an issue, because those programs still store all their data in monolithic disk image files. Similarly, Microsoft Entourage uses a single big database file to store all your email, contacts, and calendar information. So conventional wisdom says you should exclude files like these from Time Machine or other backup programs that run frequently, because otherwise your backups will take an excessively long time and require tons of disk space. Unfortunately, that also means you have to find some other, more cumbersome way to back up that data – or leave it unprotected.

If Parallels, VMware, and Microsoft were to adopt the sparse bundle format for their respective data storage needs, at least as an option, this problem could disappear. (This approach would work only under Leopard, however.) In fact, I know of at least one attempt to trick Entourage into using a sparse bundle, though the process is rather elaborate and geeky, and I haven't tried it myself. Similar acrobatics could possibly be performed with virtualization programs, basically forcing them to store their existing disk images on sparse bundles, but it would be better by far if users didn't have to jump through such hoops.

Although Entourage and virtualization programs are among the most prominent examples, undoubtedly many other applications that deal with very large files could also benefit from using sparse bundles. For all I know, perhaps developers are already hard at work bundling up their images, or perhaps technical problems I'm unaware of (beyond the requirement for Leopard) make it harder than I imagine. But for the sake of speedy and space-efficient backups, I certainly hope the sparse bundle rapidly becomes a favorite format for storing large amounts of data.

A sparse image is a type of disk image file used on macOS that grows in size as the user adds data to the image, taking up only as much disk space as stored in it. Encrypted sparse image files are used to secure a user's home directory by the FileVault feature in Mac OS X Snow Leopard and earlier. Sparse images can be created using Disk Utility.

Unlike a full image file (.dmg), which takes up as much actual space as the real disk it represents (regardless of the amount of unused space), a sparse image file (.sparseimage) takes up only as much actual disk space as the data contained within, up to a maximum of the capacity assigned during creation.

Limitations[edit]

Two limitations are therefore worth noting regarding the use of this image file format:

1. A customized '.sparseimage' image file can be assigned a larger total capacity than the physical volume (or HD partition) on which it originally resides. While the virtual volume will seem to make that capacity available, attempting to exceed the physical capacity of the underlying volume will result in a disk error: 'ran out of space'. The .sparseimage file must first be moved to a larger physical disk or partition.^{[citation needed]}
2. As noted above, while mounted .sparseimage image files automatically expand to their preassigned limit when data is added, they cannot be arbitrarily resized without the use of Disk Utility, hdiutil, or other such software.^[1][2]

Sparse bundle disk images[edit]

Mac OS X Leopard introduced the concept of the sparse bundle.^[3] Instead of a single big file, a sparse bundle is a bundle (directory) containing a number of files called bands, each on the order of 8 MB in size. This means even though to the end user the sparse bundle appears as a single file, it is composed of smaller files. As of Mac OS X 10.8, the bands are 8 MiB (8 × 1024² byte) each. When the content of the image changes, one or more band files is changed, created, or deleted. This allows backup software (such as Time Machine) to operate more efficiently.

Sparse bundle advantages for Time Machine:

• the backup destination no longer needs to be a Hierarchical File System (HFS) volume (for the hard links to work and to preserve metadata), but can be any shared folder, on any server, connected using any protocol and using any file system to store the actual files
• the entire sparse bundle is replicable from one location to another; this is particularly useful when upgrading the backup storage and when the on-site backup storage needs to be replicated to an off-site backup storage. A tool such as rsync may be used to keep one or more disk images consistent across various systems.^[4]

References[edit]

1. ^'Create a disk image using Disk Utility on Mac'. Apple. Retrieved August 13, 2020.
2. ^'hdiutil(1) OS X Manual Page'. Mac Developer Library. Apple. Retrieved January 21, 2013.
3. ^ScottW (November 5, 2007). 'Live FileVault and Sparse Bundle Backups in Leopard'. macosx.com. Archived from the original on October 29, 2013. Retrieved January 21, 2013.
4. ^'Backing up Sparse Bundle Images Over SSH'. LBackup. Retrieved January 21, 2013.

Apple Sparse Disk Image Media Markt

External links[edit]

• sparsebundlefs on GitHub - a FUSE filesystem for reading macOS sparse-bundle disk images

Apple Sparse Disk Image Media Player