"Why does an external HDD HFS+ disk shows 0 byte space when I check its Properties on Mac OS? It should have been a 1.5TB external HDD with more than 100GB data. Does it mean that all data has been deleted when its space shows 0 byte? But why the external HDD HFS+ disk becomes inaccessible? I want to get back the deleted files from this inaccessible external HFS+ HDD, but I do not know the solution. Can anybody tell me how to recover data when an external HDD HFS disk only has 0 byte space?"
It does not mean that all data has been deleted when an external HFS+ hard drive becomes not accessible and has 0 byte space. In other words, all data is still stored on the disk and you are able to recover it before adding new data. Therefore, the most important thing you should do is to search for useful data recovery software rather than formatting the external HDD to fix the problem.
iCare Data Recovery is a data recovery program which is able to recover data when your external HDD HFS+ disk shows 0 byte space. This data recovery software is safe to use for data recovery because it provides a read-only solution to scan your external HFS+ hard drive. When you use this software to search lost file on external HDD HFS+ hard drive, it does not modifying any information on the disk or cause any damage to the disk. No matter how many files you have saved on the external HFS+ disk, you are able to recover all of them in a short time by following the guide below:
Step1. Download and install iCare Data Recovery on computer. Run the software and choose a proper scan mode.
Step2. Select the external HDD HFS+ disk as aim disk and then wait the software to scan it for lost files.
Step3. You can preview found files after scanning and then save the lost data to another drive.
iCare Data Recovery is a data recovery tool which is compatible with Windows OS, so you should plug the external HFS+ hard drive to Windows computer to perform data recovery.
What is the reason for 0 byte error on an external HFS plus hard drive? In fact, when you find that your external hard drive shows 0 byte space and becomes inaccessible, it is impossible that its file system is still in HFS plus. Probably, the file system of your external hard drive has become RAW. RAW is an error file system that is unable to be recognized by Mac or Windows OS, so your external hard drive will show 0 byte space when its file system changes to RAW.
PC cannot recognize a RAW drive, so it may ask you to format external hard drive when it turns to RAW and shows 0 byte space. In other words, you can convert external hard drive from RAW to HFS+ file system by formatting. However, external hard drive will still show 0 byte space even if you format it from RAW to HFS+ because formatting will erase everything on the disk. Therefore, you cannot format the RAW external hard drive if you want to recover all inaccessible data. iCare Data Recovery allows you to recover different kinds of files from external hard drive such as Seagate, Western Digital, Toshiba, Maxtor, Transcend, Kingston, etc.
You need to format the external hard drive in order to fix the error, but when can you format it without losing any data? Usually, you can use iCare Data Recovery to restore all previous data as long as it is not overwritten, so you can format the external hard drive from RAW to HFS+ after recovering all data by using iCare Data Recovery. You can plug the external hard drive to Windows PC to format it to NTFS or FAT32 file system, or you can connect the external HDD to a Mac computer to format it into HFS+ file system.
Many factors will cause file system corruption on an external hard drive in which situation the external might turn to RAW file system. When an HFS+ external hard drive has 0 byte space, you can check if there are bad sectors on the external hard drive. If the external hard drive contains bad sectors, you can repair bad sectors at first and then format it from RAW to HFS+ file system. After data recovery, you had better backup important data to avoid data loss again.