Disk Zeroing utilities. Are there any for the Apple 2 series?
A Disk Zeroing utility works pretty much like it sounds. It looks at the un-used space on a disk and writes zeros. On the PC there are plenty of these utilities, sold under the premise they provide security and prevent data recovery & undelete.
And what about defraggers? I know (and use) something called Beach.Comber, I believe this program puts all the information on a disk at the front and in a contiguous form. Similar to a modern-day defragger and file placement utility. But it doesn't do anything to erase un-allocated / un-used sectors, and it's for PRODOS only.
I took it upon myself to write a simple utility. And the task can be done entirely in Applesoft Basic. It zero-fills the un-used sectors on a DOS 3.2, 3.3, or PRODOS disk. But I want to know if there are other utilities out there, or even if this has been done before.
My motivation here isn't security, but instead saving space when compressing disk images or even hard drive images.