DVD & Blu-ray Digitizing Storage Calculator

Why digitize your disc collection

DVDs and Blu-rays do not last forever. Discs pick up scratches, cases crack, and players are slowly vanishing from shop shelves — the new laptop in your bag almost certainly has no disc drive at all. On top of that, streaming catalogues rotate every month, so a film you bought on disc years ago can disappear from every service overnight. A personal ripped library solves all of this: your movies stream from your own hard drive to any TV, phone, or tablet in the house, and they never expire, never need a subscription, and never show an ad. The one thing that stops most people from starting is simple uncertainty — they have no idea how much drive space several shelves of discs will actually take.

How the storage math works

The arithmetic itself is straightforward. A single-layer DVD holds about 4.7 GB and a single-layer Blu-ray about 25 GB. A full disc copy — sometimes called a remux — keeps every byte, so the total is simply the number of discs multiplied by the disc size. If you would rather save space, modern H.265 (HEVC) compression shrinks a DVD rip to roughly 1.5 GB and a Blu-ray rip to roughly 8 GB, and on a normal living-room TV the difference is barely visible. The calculator above multiplies your disc counts by these per-disc sizes, converts the total into terabytes for easy comparison with retail drives, and then recommends the smallest common drive tier that holds the whole collection — from 500 GB up to 8 TB. It also estimates your ripping time, because feeding discs in one at a time is the real bottleneck of the project.

Worked example

Say you own 40 DVDs and 20 Blu-rays and you want full-quality copies. The DVDs contribute 40 × 4.7 GB = 188 GB, and the Blu-rays contribute 20 × 25 GB = 500 GB, for a total of 688 GB — about 0.67 TB. That fits comfortably on a 1 TB external drive, which is the recommended tier here. Ripping time is another matter: at roughly 20 minutes per disc, 60 discs need about 20 hours of drive time. That sounds like a lot, but it is unattended time — load a disc, walk away, come back later. Most people finish a collection like this in the background over a week or two of evenings. Switch to H.265 compression and the same collection shrinks to just 220 GB, which fits a 500 GB drive with room to spare.

Practical tips

Start with the favourites you actually rewatch rather than ripping everything at once; you will learn your workflow on the discs you care about most. When you buy a drive, leave yourself 20 to 30 percent of headroom — collections grow, and full drives slow down. Keep a second copy of the finished library, ideally in a different place, because one failed drive should never erase years of work; this is the old 3-2-1 backup rule in miniature. And one legal note: only rip discs you own, and check the rules where you live before bypassing any copy protection, since that step is restricted in some countries even for discs you bought yourself.