Okay, being rather ignorant of most of the terms used in these threads, I don’t actually know the difference between having my music now stored on a pen drive, or having a full archival back-up (the apparent advantage of ISO, if I’ve read it correctly).
An
ISO is just a complete copy of the disc itself (minus any Redbook CD information if present as on hybrid SACDs). Google is your friend, you can research any term you see here to find out what it means, very often the best search result will be something like Wikipedia, which is what I've linked to above.
It also helps the members of the forum if you reply to specific post(s) (like I've done here), that way we know exactly what you are referring to and it provides context, as opposed to just wondering out loud without referencing anything, that's much more difficult to respond to, and also harder for future readers of the thread to follow along.
The storage on a pen drive aspect is a separate topic, in other words, you can store these files on any number of different storage devices, and then how you play back from them is not a ripping topic, that's where the DSD playback options thread comes in.
The part that is a ripping topic is the settings for what file type you use to make the rip. I personally rip straight to stereo DSF only, because I do not have any surround system and don't see the day when I will, so there is a decision made there by me that I will skip the full ISO disc copy back-up, and just extract DSF stereo.
However, the exact particular way anyone does it is a personal choice, and there is not only one "right" or "correct way", if there were, then that would be the only way offered by the software and you'd have no setting to make a choice and use, it would be done for you.
The reasoning behind a full ISO was stated in previous posts, because it is a full archival back-up of the disc itself, and that is self explanatory. If something were to happen to the disc, you'd have an archival back-up. Whats the penalty then you ask? MUCH more storage space is required than if you were to just extract the stereo DSF files as I do. I elect to consider the SACDs themselves as the actual archive, but again, there is no one single correct way to view this, everyone can consider it in their own way.
The flexibility offered in extracting DSF not from the SACD itself (as I do), but instead from an ISO, is that the ISO resides on your computer (or in your case a pen drive), and the extraction speed from that medium is far greater than the speed you can extract from an optical disc, where the actual optical disc drive (the player) is the speed bottleneck. I have hit 55 MB/sec in some cases when extracting DSF from an ISO, you will never get much better than about 3 MB/sec when extracting DSF from the SACD itself.
Whats the penalty then you ask? Why wouldn't everyone just always extract from an ISO? As stated above, the penalty is storage space requirement, if you don't need the surround tracks (like me) because you don't have a surround system and have no plans for one, then it probably makes more sense to just rip straight to stereo DSF and leave it at that. But that isn't a statement of fact, that's a personal choice, weighing several factors including time, and the storage costs.
The weighing of the time involved is also multifaceted, the "penalty" in extracting an ISO is that you have to go to a 2nd step of then extracting DSF tracks from that ISO, and that takes more time, though as stated above, it can reach very high extraction speeds from ISO not attainable from the SACD and optical disc drive in the player itself. What
@NSBulk is saying, is that if you have already ripped to ISO in the first place, you can then at your leisure elect to extract either the stereo or multichannel (or both) from it.
Lets say you are me and you have no surround system set-up nor do you see that day coming. You would just extract the stereo DSF from the ISO, and call it a day. The ISO is then placed on a storage device (you can get a 2TB external hard drive these days for about $60) for safe keeping, and the day you ever do get a surround set-up, bingo, you pull out the archival ISO and extract the surround content.
The author of this software actually does it a 3rd way, and this really makes the most sense to me, and probably makes the best most efficient use of one's ripping time. He uses "Concurrent Mode" which is done by selecting ISO+DSF in the software. This is a brilliant upgrade to the original software ripping packages such as ISO2DSD that did not offer this function (thank you setmind/aka Mindset!). Using that ISO+DSF function, you get the creation of both an archival ISO, and separate DSF tracks too in just one pass of the optical media. So there is no extra wear and tear on the Blu-ray player, it is still making just one pass of the SACD, and then the software does the processing necessary to create both an ISO and the DSF from that single pass.
Sound great right? Whats the penalty in using Concurrent Mode? Again, additional storage space is required as opposed to just extracting DSF, and it does of course take much longer, there are no free lunches with regard to computer processing speed. Depending on your computer's CPU (# of cores, speed rating), and the amount of RAM your computer has, it can take a good deal longer to run the rip in Concurrent Mode, because there is
much more going on. But then you wouldn't need to take that extra step in extracting DSF from the ISO as described earlier, because the DSF is extracted from the ISO in real time in Concurrent Mode. It's made even more efficient by use of the Output Directory function, if you select ISO+DSF and then go to that Output Directory field, it even allows you to write the ISO and the DSF to two separate places at once. So for example you can write the DSF tracks that you will ultimately be using for playback to one hard drive, and then direct the writing of the ISO to a completely separate/different hard drive for archival safe keeping, and it will do those writes simultaneously, again with speed as the penalty, that simply takes a while to complete each disc that way. But if you invest the time there, you are done with that SACD, you have both the DSF and an ISO written and in theory that SACD can now be stored away forever.
Part of what you need to do here is actually play around with the software, use it and get familiar, and then ask yourself in your particular circumstances what the best approach will be. One thing is for sure, a 256GB pen drive is not big enough to house any decent sized SACD collection, and you've confirmed that by quickly filling it. You will need a storage solution that is both larger capacity and more robust from an ultimate reliability standpoint. But unlike the actual disc ripping instructions, no one can list out step by step exactly what you need to do, you'll have to look at the file sizes of your rips, count the number of discs in your collection, probably also allow for the possibility of buying some new SACDs in the future, and come to a ballpark idea of how much storage capacity you will need. Also consider how that needs to be separated on more than one hard drive, i.e. one for back-up archival purposes, and the other used for actual playback.
Yes, the playback considerations need to go in the playback thread, I suggest you don't want to use a USB pen drive for playback, you need a separate server somewhere and then access it using the Oppo's DLNA/UPnP playback function, which means you will stream the tracks from a server to the Oppo over your home network. Again, that's really a playback topic and belongs in the playback thread.
Most everyone didn't originally know what many of the terms used in this thread meant, and so you research it using Google to gain a better understanding of what any given term means, and how that relates to your specific needs in ripping and the actual playback of those rips.
When I first started ripping SACD in spring 2016, there was no SACDExtractGUI, that program only came in October 2018. Back in 2016 there was only ISO2DSD, and though that was and still is a fine program, it didn't offer the flexibility described above that is standard in SACDExtractGUI. But I can't turn back the clock now, in 2016 I made the choice to only rip straight to DSF, because there was no Concurrent Mode available to me.
Should I have then just made all ISO rips at that time? Perhaps, but it would have required me to go back and extract DSF from each ISO created, a two-step rip process on literally hundreds of SACDs. I elected to go straight to DSF extraction instead, and I'm not sorry about that, as there is no one single "correct" way to do this. Ripping Stereo DSF only saved me valuable time, because I have no specific use for the multichannel.
We do not form separate "camps" on topics here at HFH, where strict dogma is cited as the one and only single "best" or correct way to do something and all other ways are rejected and endlessly fought over, each camp digging in their heels and insisting they are right, sticking to that stance to the death. Thats for other forums.
SACD ripping is no different than any other topic here, there are a bunch of ways to do it and each single person needs to view those methods in the context of their own unique situation in order to best decide how to proceed. I'm not sorry I didn't create ISOs way back in 2016, I consider the SACDs themselves to be my archive, and I rip straight to DSF, skipping the whole ISO process. Others do it differently, and that's fine too, neither of us is right or wrong, it is a matter of preference.