sparkfor.blogg.se - Hard drive showing wrong capacity

Therefore all the available filesystem drivers are unable to mount the filesystem as a drive. Properties of the drive show that both used and free spaces are 0 byte in size for the raw driveĪ RAW filesystem simply means that it is a filesystem that is not recognized by Windows. Here we will look at the causes, fixes and preventative measures for instances involving external drives being used with Windows XP and Windows Vista/7/8.Ĭommon error messages associated with the sudden inability to access an external hard disk drive. When approached sensibly and carefully, the situation can be resolved and the data saved more times than not. It can be a breathtaking experience to suddenly be told that your data, often irreplaceable pictures and documents, might be gone forever.Īs with many similar situations in life the appropriate response is “Don’t panic”.

So with all of that in mind, here is a revised version that hopefully addresses some of the shortomings of the post that was originally released in January of 2013.Ī common and befuddling problem with computers is the sudden and seemingly inexplicable disappearance of an external hard drive that has been functioning properly.

Many many many comments from people have been posted that show common problems that are not directly addressed by the original post.

Hard drives larger than 500GB have become commonplace.

The end result is that a hard drive labeled by the manufacturer as being 1TB will be reported by most operating systems as 931GiB.It has been well over a year since last updating my post on ‘Recovering an external hard drive that has suddenly become RAW’ and there have been some significant changes. Because of all of this, instead of dividing by factors of 1000 (or shifting 3 decimal positions) we are shifting 10 binary positions effectively dividing by factors of 1024. This does not take into account the possibility that more registers may need to be preserved (stored elsewhere) for the DIV instruction than the SHR instruction and recovered afterwards increasing the execution time even more. If there are cache misses, NAN errors, etc., the number of clock cycles for the DIV instruction can result in 100 cycles or more being added to the time required to perform the operation.

The DIV instruction to carry out the base 10 math will end up executing at least 4 times longer than doing SHR instructions for the base 2 math (minimum of 41 cycles as opposed to a maximum of 10). The advantage of using base 2 math means that the code is somewhat simpler and it will run faster. Drive manufacturers report drive sizes using base 10 math while computer operating systems tend to report these sizes using base 2 math.