IsoBuster released its official "Beta" with DVR support, yesterday, June 3, 2019
Release Notes - IsoBuster Beta 4.4
The RDR-HXD995 is not one I could test directly, but it is "estimated" to be auto-detected and supported as a Pioneer model DVR-550 or DVR-560.
What makes IsoBuster different from previous scripts and do it yourself python coding, is IsoBuster is a windows program that runs on everything from Windows XP to Windows 10, and on Wine on OS X. It can read the DVR hard drive even though Windows does not understand its format. The user interface is more or less like the windows File Manager, with right click options for "extracting" recordings, that allows you to copy the recording to another drive or places connected to the PC. Finding a particular recording is made easier because IsoBuster "associates" the Titles and Names the DVR recorder displays for playback with the recordings in the file manager interface. If a recording has no Title or a Duplicate title as some manual recordings through a Line Input tend to, you can find a recording by its approximate date and time of creation. IsoBuster will also helpfully offer to append sequential numbers to multiple recordings with the same name to make them unique on the destination file system.
It is not a free program, but the trial does allow you to attach a drive to the PC and browse its contents to see if extraction is possible. DVR support is a premium feature so it requires the Professional license.
You have to remove the hard drive from the recorder and that takes a few tools, and you need a way to attach it to your PC.
The HXD995 has a parallel or PATA IDE drive, which is uncommon today, but a USB drive dock or adapter that supports a full size 3.5 inch IDE hard drive is more than adequate. The docks or adapters that connect using a parallel cable or don't require you to remove the recorder hard drive from its carrier are best. The recorder carrier often has plastic melted in its threads called "Lock-tite" to prevent removing the drive mount screws.
When its first attached, Windows often offers to "FORMAT" or "INITIALIZE" the drive for you.. do not do that
! It will also harshly warn you won't be able to "use" the drive until Windows Formats the drive.. Do Not Do That
. IsoBuster does not need to do any of that, it by-passes windows and only reads the bits off the drive.
You should also be forewarned that SONY and Pioneer have to "authorize" drives they do not recognize, and require a service remote to "re-authorize" a drive if its "tampered with" while its removed from the recorder. Windows "writing" to the drive qualifies as "tampering".
This use of a service remote is unique to the SONY and Pioneer brands, other brands have different "pairing" procedures.. some easier, some harder to do. - Its generally not a problem, unless you slip on the keyboard, or allow Windows to write to the drive.. do not allow windows to "Initialize, Format" or do anything else "helpful or automatic" while its attached to a PC.. and everything generally works.
That is the recorder will work as before when you reinstall the hard drive back into the recorder.
Never write to the recorder hard drive or allow any program to write to the recorder hard drive while its attached to a PC. Only make changes to the recorder hard drive (such as deleting recordings, or re-formatting the recorder hard drive) with the recorder itself.
This should be somewhat obvious, but the ease with which this works, makes you overconfident really fast.
Some people get overly eager and (think) they can upload video or make changes on the hard drive like it is a PC hard drive while its outside the DVR recorder.. with certain late model Game Capture recorders that is true.. but for anything "Professional or Prosumer" like these older DVRs it is not true.. do not try it, you will brick the DVR and require a great deal of help to salvage the unit.. if its even possible.