At times, due to the incorrect settings in the file system permissions or privileges, your Mac system fails to boot. The system hangs infinitely at the startup screen and all your data in the hard drive becomes completely inaccessible. Under such instances of data loss or inaccessibility, any good Mac data recovery utility can help you recover all your precious data back.
Though there can be a number of reasons behind such a problem, sometimes attack of a virus or any sudden system shut-down results in the file system corruption and possible alteration in the permission settings.
Please make sure to examine this short article very carefully, the challenge and the alternatives have various different versions. In order to resolve the issue and retrieve back the data, you need to run the Disk Utility or “fasck” command as below:
Run the Mac system in safe mode by continuously pressing the “SHIFT” key at the start-up. If the system fails to boot even in the safe mode, run the Disk Utility. For this, you need to insert the Mac OS X installation disc and try to boot, while holding the key “C”. Under Disk Utility, choose the tab, “First Aid”. There, select the damaged Mac volume and click “Repair”. If after the repairing process, the problem still remains, run the “fsck” command by typing /sbin/fsck -fy at the command prompt.
But, if one of your partitions is corrupt due to certain logical errors, and hence you can’t access it with several important data including your marriage album. Finally, you’re hopeless as well as helpless, because of you finally there is nothing you can do except only reformatting the partition to make it usable again, which will right away delete all the invisible images of the safety of which you’ll bet anything. What will you do? Real headache!
Let’s proceed with this writing. Luckily, there is one thing you can turn to at your disposal. Run a data backup process. This simple but useful built-in facility available in every computer may successfully recover your images. Even so, it must be borne in mind that no data should be written on the reformatted partition before you have run data backup process and recovered the images. Otherwise, there are great chances of the hitherto invisible data’s getting overwritten.
Additionally, with severe corruption, sometimes, even the “fsck” command fails to repair and you have to format the drive. Though, formatting the troubled drive and making fresh partitions usually resolves the error, all your data from the drive gets erased.
Still, you can restore the formatted data from a previously taken valid backup. But, if you don’t have any backup available, you’re left with the only choice to opt for any efficient data recovery Mac software to retrieve the data back.
You should study the next few paragraphs properly, the case and the alternatives have countless variants. These Mac file recovery software are built with advanced algorithms to locate and recover the lost, deleted, formatted data quite efficiently. These utilities are completely read-only in nature and don’t harm neither the media nor the data in it. Moreover, with the highly interactive graphical user interface, any user can use the software without even much technical knowledge. Macintosh Data Recovery is one of heavily used and widely appreciated Mac recovery software. The software is powerful enough to retrieve your valuable data back from any instance of data loss. This reliable utility is compatible with Mac OS X 10.6/10.5/10.4.10.3.9 and can recover your data from HFS, HFS Wrapper, HFS plus, FAT file system based volumes.
Stellar Phoenix Macintosh Data Recovery is one of heavily used and widely appreciated Mac data recovery software. The software is powerful enough to retrieve your valuable data back from any instance of data loss. Mac Recovery is reliable utility compatible with Mac OS X 10.6/10.5/10.4.10.3.9 and can recover your data from HFS, HFS Wrapper, HFS plus, FAT file system based volumes.…
Are you trying to find information about Raid four data recovery? If you’re, you’ll soon enough find out that the actual RAID four recovery process is similar to all other RAID four data recovery techniques. The biggest difference that you’ll find is the actual set up of the system and the way the disk drives store data.
In order for a configuration to be considered a RAID four there must be a minimum number of three drives. Although this is the minimum number of drives, the 3 drive setup isn’t very common due to the fact that it lacks redundancy.
One of the key strengths to RAID four is the fact that it allows for simultaneous read requests when data striping. Data striping more or less refers to the way that the data is segmented. In the RAID four configuration, it is able to segment the data in a logically sequential way. When the segmentation is done this way, the data can be accessed concurrently, which allows the processor to not have to wait to access data.
The biggest weakness that has been noted of the RAID four data recovery is that there is a single parity bottleneck. In this case, parity refers to the approach used in an attempt to verify if data has been lost or in some other way compromised.
RAID four data recovery would become necessary if any one of the disk drives in the configuration suffered any level of damage that caused data to be lost or damaged. Unlike other configurations of RAID, the data in RAID four is not mirrored, so there is no other copy of the data that’s simultaneously made when it’s being written. One of the most commonly used techniques in RAID four data recovery is to start the recovery process on the drive right before the one that suffered damage, and then to perform the recovery on the disk drives directly after.
Though in many cases, significant amounts of data can be recovered, isn’t uncommon at all for at the very least, a minimal amount of data to be lost especially if it’s a case of physical damage being done to the drives. One way to avoid this is to consider a configuration that at the very least includes the ability to have data mirrored in some way as it’s written, which is often the case with a RAID two configuration.
Also Read: Raid four Data Recovery
Recovery of lost data needs state-of-the-art equipment which costs a lot of money. The services should have such equipment and the requisite clean room where the recovery process is carried out. Improper handling of the disk by unskilled technicians might result in complete loss of data forever which can prove detrimental to the interests of the client.
Educating clients regarding immediate steps to be taken in case of data loss is also an essential part of data recovery services. They should issue proper instructions such as not using the system until it’s examined by their team. They should also provide guidelines for future such as advising clients to retain proper backup of data at all times.
DataRecovery But DataRecovery does not assure that all files deleted can be recovered successfully.It mostly depends on your system/configuration and we cannot support
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The original data have been modified in the following way: Original essays were put through an anonymization process that replaced references to persons, places, and locations with tokens. So, if a student wrote that “her name was Jada, attended school at Jackson High School in Canton, OH”, this would be replaced with “her name was @person, attended @place high school in @location”. There were a few essays that were eliminated because the anonymization process was ineffective in scrubbing the text sufficiently to eliminate information that might lead to the identification of an individual writer.
In order to assess the suitability of the anonymized data for evaluating automated essay scoring systems, a small internal study was completed with the LightSIDE engine to determine the degree to which there might be differences. LightSide is an open-source scoring engine developed at Carnegie Mellon University and was included along with the commercial vendors in the first study. In that study the engine demonstrated a high agreement with human ratings, but had no NLP capabilities.
The analysis was performed because it was suspected that the anonymized data might be harder to model than the original data since it would contain less specific information. However, the LightSIDE model showed only a slight correlation drop from .763 to .759, which, based on a t-test, was not statistically significant (p = .15), on quadratic weighted kappa across the data sets. While the data anonymization process therefore seems not to have substantially impeded the ability of machine-learning based systems to model human scores on this data set, it may have had the effect of making it more difficult for participants to develop features related to deeper aspects of writing ability. Since content words were replaced with meaningless symbols in the process, the grammatical structures and meaning relationships within each essay were certainly made less accessible, even to human readers.
Also Read: TRANSCRIPTION…
Six of the essay sets were transcribed from their original paper-form administration in order to prepare them for processing by automated essay scoring engines, which require the essays to be in ASCII format. This process involved retrieving the scanned copies of essays from the state or a vendor serving the state, randomly selecting a sample of essays for inclusion in the study, and then sending the selected documents out for transcription.
Both the scanning and transcription steps had the potential to introduce errors into the data that would have been minimized had the essays been directly typed into the computer by the student, the normal procedure for automated essay scoring. Essays were scanned on high quality digital scanners, but occasionally student writing was illegible because the original paper document was written with an instrument that was too light to reproduce well, was smudged, or included handwriting that was undecipherable. In such cases, or if the essay could not be scored by human raters (i.e., essay was off-topic or inappropriate as determined by human raters), the essay was eliminated from the analyses. Transcribers were instructed to be as faithful to the written document as possible keeping in mind the extended computer capabilities had they been employed. For example, more than a few students used a print style in which all letters were capitalized. To address this challenge, we instructed the transcribers to capitalize according to conventional practice. This modification may have corrected errors that would have otherwise been made, but limited the over-identification of capitalization errors that might have been made otherwise by the automated essay scoring engines.
Also Read: OVERVIEW OF THE DATA RELEASE GUIDELINES
The first transcription company serviced four prompts from three states and included 11,496 essays. In order to assess the potential impact of transcription errors, a random sample of 588 essays was re-transcribed and compared on the basis of error rates for punctuation, capitalization, misspellings, and skipped data. Accuracy was calculated on the basis of the number of characters and the number of words with an average rate of 98.12%. The second transcription company was evaluated using similar metrics. From a pool of 6006 essays, a random sample of 300 essays was selected for re-transcription. Accuracy for this set of essays was calculated to be 99.82%.
Two of the essays were provided in ASCII format by their respective states. The 10th grade students in those states had typed their responses directly into the computer using web-based software that emulated a basic word processor. While the test employed digital technology, the conditions for testing were similar to those in states where the essays had been transcribed.…