Somewhere in a cupboard, a box of DVDs and Blu-rays is quietly gathering dust. The discs still play, but the laptop on the desk has no disc drive, the living-room player was retired years ago, and the films themselves keep vanishing from streaming services every few months. Digitizing a disc collection — ripping each disc to a file stored on a hard drive — solves all of that at once: the whole library streams to any TV, phone, or tablet in the house, with no subscription, no ads, and no expiry date.
The question that stops most people before they start is a practical one. How much hard-drive space does a shelf of discs actually turn into? A hundred discs sounds like a lot of plastic, but in gigabytes it is a surprisingly manageable number — provided the math is done before the first disc goes in.
How Much Space Does a Single Disc Need?
It starts with the capacity printed on the disc itself. A standard single-layer DVD holds about 4.7 GB, and a single-layer Blu-ray holds about 25 GB. Those are the raw ceilings: a full, bit-for-bit copy of a disc — often called a remux — can never be larger than the disc it came from, and in practice lands close to it.
Dual-layer discs raise the ceiling. A dual-layer DVD stores roughly 8.5 GB and a dual-layer Blu-ray about 50 GB, and many commercial movie releases are pressed on dual-layer media. Box sets and special editions are worth checking individually, because a "100-disc collection" of dual-layer Blu-rays is a very different storage project from 100 single-layer DVDs.
Full Disc Copies vs H.265 Compression
A full disc copy keeps everything: the film, every audio track, every subtitle, every menu. It is the archivist's choice, and the math is trivially simple — discs multiplied by disc size. The price is space. A serious collector's shelves can easily demand a multi-terabyte drive before a single extra file is added.
Modern compression changes the equation dramatically. Ripping to H.265 (HEVC) — the same codec used by 4K streaming services — shrinks a DVD to roughly 1.5 GB and a Blu-ray to roughly 8 GB. On an ordinary living-room television, viewed from the sofa, the difference between a compressed rip and the full copy is barely visible. The trade-off is time: encoding to H.265 takes longer than a straight copy, and very old devices may struggle to play the format.
H.264 sits between the two — larger files than H.265, but playable on practically anything ever made. Many people rip the films they rewatch constantly as full copies and compress everything else, getting the best of both worlds.
| Format | Full disc copy | H.265 compressed rip |
|---|---|---|
| DVD (single-layer) | ~4.7 GB | ~1.5 GB |
| DVD (dual-layer) | ~8.5 GB | ~2.5 GB |
| Blu-ray (single-layer) | ~25 GB | ~8 GB |
| Blu-ray (dual-layer) | ~50 GB | ~15 GB |
Worked Example: A 40-DVD, 20-Blu-ray Collection
Consider a typical mixed collection: 40 DVDs and 20 Blu-rays, ripped as full-quality copies. The DVDs contribute 40 × 4.7 GB = 188 GB, and the Blu-rays contribute 20 × 25 GB = 500 GB. The total is 688 GB — about 0.67 TB — which fits comfortably on a 1 TB external drive, the sensible tier for this collection.
Switch the same collection to H.265 and the picture changes completely: 40 × 1.5 GB = 60 GB for the DVDs plus 20 × 8 GB = 160 GB for the Blu-rays, or 220 GB in total. That fits a 500 GB drive with room to spare, and the drive itself costs a fraction of the 1 TB one. This is why the compression decision matters more than the disc count.
What Size Drive Fits Your Collection?
Retail drives come in standard tiers — 500 GB, 1 TB, 2 TB, 4 TB, and 8 TB — and the rule is to buy the smallest tier that holds the finished library with headroom to spare. A drive that is completely full is a drive that cannot accept the next box set, and full drives also tend to run slower.
| Collection (full copies) | Approx. total | Recommended drive |
|---|---|---|
| 50 DVDs | ~235 GB | 500 GB |
| 100 DVDs | ~470 GB | 1 TB |
| 50 DVDs + 25 Blu-rays | ~860 GB | 1 TB |
| 50 Blu-rays | ~1.25 TB | 2 TB |
| 100 Blu-rays | ~2.5 TB | 4 TB |
| 200 Blu-rays | ~5 TB | 8 TB |
With H.265 compression, most of these rows drop one or two tiers — the 100-Blu-ray collection, for instance, shrinks to roughly 800 GB and fits a 1 TB drive. Run the numbers for the exact mix before buying anything.
Ripping Time: The Hidden Cost of the Project
Storage is the easy part. The real bottleneck is the ripping itself, because discs must be fed in one at a time and each one takes roughly 20 minutes. A 60-disc collection needs about 20 hours of drive time; a 200-disc wall of Blu-rays can absorb the better part of a week.
The time is unattended, not labor. Load a disc, walk away, and come back later — most people finish a medium collection in the background over a week or two of evenings.
A second optical drive doubles the throughput for a modest outlay, and ripping while working from home turns dead hours into progress. The practical advice from everyone who has finished the job: start with the favourites that actually get rewatched, so the workflow is learned on the discs that matter most.
Picking the Right Drive and Protecting the Library
For the finished library, a plain external hard drive is the economical choice — large, cheap, and fast enough for several simultaneous streams. Solid-state drives are quieter and tougher, but the price per terabyte is still several times higher, which stings at multi-terabyte sizes.
Whatever the drive, leave 20 to 30 percent of it empty. Collections grow, drives slow down as they fill, and a library with no headroom is a library that needs migrating within a year. And keep a second copy of the finished library, ideally in a different place — an old drive in a drawer at a relative's house counts. One failed drive should never be able to erase years of ripping work.
The Legal Fine Print
Only rip discs that are actually owned — a personal backup of a purchased disc is the entire premise of the project. Bypassing the copy protection on commercial discs is restricted in some countries and permitted in others, so it is worth checking the local rules before starting. The ripping software itself is legal everywhere; it is the circumvention step that varies.
Try it now: DVD & Blu-ray Digitizing Storage Calculator — enter your DVD and Blu-ray counts, pick full-copy or H.265 quality, and get the total size, the right drive tier, and a ripping-time estimate.
Frequently Asked Questions
How many DVDs fit on a 1 TB drive?
About 200 single-layer DVDs as full disc copies (200 × 4.7 GB ≈ 940 GB), or roughly 650 DVDs ripped with H.265 compression at 1.5 GB each. Mixed collections with Blu-rays fill the drive much faster — just 40 Blu-rays as full copies already need a full terabyte.
Is H.265 quality good enough for a big TV?
For most viewers, yes. At typical sofa distance on a 55-inch television, a well-encoded H.265 rip of a Blu-ray is very hard to distinguish from the full disc copy. Videophiles with large screens and projectors tend to keep full copies of their favourite films and compress the rest.
How long does it take to rip 100 DVDs?
At roughly 20 minutes per disc, about 33 hours of drive time — but it is unattended time. Most people feed discs in during evenings or while working from home and finish 100 discs within two weeks. A second optical drive cuts the calendar time roughly in half.