You have to create the primary partition, which will create a drive with assigned letter for you. Or you can create the extended partition where you can create logical drives it can be more than 1.
In Windows Vista, unallocated space refers to disk space that has not been assigned to any partition or volume, while free space is the available space within an existing partition that can be used for data storage. Unallocated space cannot be used until it is formatted and assigned to a partition, whereas free space can be immediately utilized for file storage or for creating new files within an existing partition. Essentially, unallocated space is "unused" space that needs to be set up, while free space is "available" space within a partition.
The only reason you could lose space is corruption in the Master File Table, and the only fix is to reformat your disk you can't delete space from your hard drive unless you replace it with a smaller one. If you are asking about what happens if you choose to "wipe" or "delete" the free space, that just means that the free space is overwritten. You would overwrite unallocated space for privacy and confidentiality reasons. Since that is free space, no harm would occur if it were overwritten. Now, if you have an SSD drive, then you'd do better to Trim the drive, since that would reformat any previously used but unallocated blocks without adding unnecessary wear to the drive.
Because you did not format it properly, or you have deleted partitions, and all free space is in unallocated sector.
You will have to add additional hard drive and create dynamic volume which will allow you to add your new hard drive to a current partition. No, I mean use the free space of one partition to extend the non-contiguous partition, I learned AOMEI Partition Assistant could do this operation, here is the tutorial : disk-partition.com/help/align-partition.html
To sell a laptop, you will need to erase everything on the hard drive before selling it. There are hard drive erasers available which are free of charge.
It requires 20 GB of free hard drive space.
80 GB
A 20GB hard drive with at least 15GB free space.
I used a program called EaseUS. My laptop's hard-drive came split in two with the recovery partition only occupying less than 4GB of space. I used EaseUS to repartition the drive - giving me an extra 80% space on drive C - WITHOUT having to re-format and re-install anything ! See related link to their website for the free download.
My Computer > Highlight (C:) > Right Click > Properties > Now you can see the free space and the used space
The OS (operating system) takes up space on the drive.
I do it to free up space on the hard drive.