Verbatim 43823 25GB 4x M-Disc BD-R - 5 Pack Jewel Case

Worked great in my Asus blu-ray disk writer. They are in a standard CD case with a printable and writeable disk label. I used Sharpie permanent marker to write on mine. They are reported to have a 1000 year life but someone else will have to report back in that feature!

I bought these to backup the data I cannot afford to lose in a virus, malware or ransomware attack.Bought from Amazon EU, and each disc is shrink wrapped and all barcodes match Verbatim's website.I saw concerns about scratches in the inner ring and burn failures so I was concerned given the price.While the scratches are definitely there, they're in the inner ring where the 3 serial numbers (1 per layer) are, so nothing is written there and they don't impact quality.The discs are identified as MID: VERBAT-IMk-000, which verifies on the BluRay site as HTL (High-to-low Inorganic) BDR V3.0.Burned with a Pioneer BDR-XD05T drive from Aug 2014 (which has no claim to support MDisc on it, but works because MDisc adheres to all BluRay standards).Used ImgBurn (from a mirror site to avoid the Adware from the genuine site) and created a 100GB ISO Image (Mode1/2048 using ISO9660+Joliet+UDF with UDF 1.50).My first disc image contained 25,180 files in 595 folders totalling 92,368,211,531 bytes. I also MD5 summed each file and saved the checksums to the BD as well.It took 26 minutes to create the image on the local disc, then I burned at 2x speed for safety which took 2 hours 55 minutes, then 1hr 31 minutes to verify the disc to the ISO.I also verified all MD5sums after the disc had cooled off which tool another 2 hours 32 minutes.Both the ImgBurn and the MD5Sum file verifications were good.The discs show up as 90.2GB in Windows, but that is because of the difference in units i.e. GB vs GiB.In short, I am happy that these Discs are as described and when burned at 2x speed, have no failures.I would say ignore the "you don't get 100GB", the "scratches on the inner ring" and "burn failure" reviews on here. My opinion is that those reviews come from misunderstandings about the tech and probably burning directly without using ISO first.I will be buying more of these again.As to whether they last longer than standard BD-XL or whether I should be using single layer 25GB MDiscs, only time will tell. I'll probably check the MD5 sums once evert couple of years to ensure the backups are still valid and take more/move files to a new disc if there are issues.

The prices of M-Discs have shot up recently, which I understand. However Verbatim advertise these as 25gb of storage.NO!These are 22GB capacity in 25GB packaging.I understand that due to the nature of storage, the space can be a little higher or lower, but by 3GB?!! No way José!Really annoyed at this as it's totally messed up my archiving organisation.*Please note: this is not the fault of the seller. This is solely about the manufacturer which the seller has zero control of.*

all ok

You can fit 45min+ of FM RF captures of VHS (16msps 8-bit FLAC) or a full MiniDV tape on a single 25GB disc, its only a shame 128GB discs are only made by Sony but never got the M-Disc adaption.All modern BD worm disc media is long life reliable (HLT discs) but M-Disc's molding is what makes it really stand out, though some will argue glossy carbon is a more reliable substraight, your paying for the better grade plastics and better grade meterial.ISO/IEC 10995:2011 & ECMA-379 - are the standards it confroms to if you want a fun read.At the end of the day, we all will most likely be long dead before these discs degrade, unless they are in a house fire not much can break the encasing polycarb plastics, these are perfect to backup your factory stamped DVD/BD discs and or anything else for long term archival at room tempratures.

These are expensive but if you are dealing with valuble data then they are worth investing in.

These are expensive to buy, but if you want an offline copy of important data (financial record, children pictures/videos etc etc), this is pretty much the only consumer level device to do this. Optical media has also had a good history of backward compatibility spanning many decades.The claimed life of many hundreds of years is, of course, going to be hard to prove, but nothing else claims this longevity.The Blu-Ray's can be written with any Blu-Ray writer, but I have always used one with MDISC branding (which is technically only needed for MDISC DVDs). The key thing is they can be read by ANY drive and written with standard software.

Writing to these disks was simple, will be waiting a while to work out what their performance is like. Hoping they perform better than some standard disks which have degraded over the years. These are very expensive but there's probably not much demand for this niche item.