Collecting guides

How to Store CDs and Booklets Without Making It Complicated

Published 6 October 2026

On a CD the music sits just under the artwork. How to store discs and booklets, what is known about CD rot and lifespan, and how to check a disc tonight.

You take a CD off the shelf, turn it over and tilt it under the lamp, looking for scratches on the shiny side. It’s the natural check. It’s also only half the check. On a CD the side you’d happily put down on a table is the tough one, and the side with the artwork on it is where the music is kept.

That one fact reorganises most of what there is to know about storing CDs. The disc is sturdier than it looks from underneath and more fragile than it looks from above, and the paper that shares its case is the part most likely to change over the years. Look after those two and the rest follows.

The music sits under the artwork

A CD is mostly clear polycarbonate. The music is moulded into it as a spiral of tiny pits, covered with a thin layer of reflective metal, sealed with a very thin lacquer, and the label is printed on top. So the data sits almost at the upper surface, just below the print. The laser reads it from underneath, through the whole thickness of the plastic.

The clearest explanation of what that means is a 2003 guide from the US National Institute of Standards and Technology, written by Fred Byers for librarians and archivists. A light scratch on the playing side usually doesn’t matter, because the laser is focused beyond it, the way you look through a scratch on your glasses. The player’s error correction recovers much of the rest. On the printed side it’s a different story: a pinhole in the metal from a scratch, a pen, a pencil or an ultrafine marker destroys the data beneath it, and that damage cannot be repaired.

The habits that follow are small. Hold a disc by its edge and the centre hole, and put it back in the case rather than on the table. If you must mark a disc, the Canadian Conservation Institute’s advice is to write only on the clear ring around the centre hole, which holds no data, with a water-based felt-tip. Both NIST and the CCI rule out stick-on labels. Peeling one off can take the metal with it.

Scratches have a direction

The playing side isn’t invulnerable, it just forgives more. NIST makes two points that are worth knowing before you ever pick up a cloth.

First, fingerprints and smudges can cause more read errors than scratches do, because they spread across a wide area rather than crossing it. Second, the direction of a scratch matters. The music is read along a spiral track, so a scratch that runs around the disc, following the track, hits one long continuous stretch of data and is more likely to cause errors the player can’t correct. A scratch running from the centre outwards clips many parts of the track briefly, and error correction stands a far better chance with those.

Which is why the right way to wipe a CD is in straight lines from the centre to the edge, never in circles. A clean cotton cloth does most jobs. For anything stubborn NIST allows isopropyl alcohol, and warns that acetone dissolves the disc itself. The CCI adds the sensible counterweight: frequent or careless cleaning can do more harm than the dirt did.

If you’re checking a used copy in a shop, this changes where you look. Radial scuffs on the playing side are usually cosmetic. A pinhole where lamplight shows through the metal is not, and neither is a gouge in the printed side. Our guide to checking a used CD before you buy goes through the rest of the inspection.

Do CDs rot, and how long do they last?

Some do. Disc rot is real, and NIST describes it precisely: the thin aluminium layer oxidises, loses its reflectivity, and the laser can no longer read the music beneath it. Oxygen and moisture reach the metal through the plastic, the lacquer and the edge of the disc, and more easily through a scratch or a lifting label on the printed side. Heat and humidity together speed it up. For a pressed disc, NIST calls oxidation the main way the environment wears it down.

How long a pressed CD lasts is the part nobody can tell you for your own copy. NIST wrote in 2003 that little information was available for read-only discs, audio included, and that expectations varied from 20 to 100 years. The Canadian Conservation Institute gives a well-made pressed CD 50 to 100 years at 23 °C and 50% relative humidity. The Library of Congress tested the question directly. It aged pairs of audio CDs, almost all made between 1992 and 1999, in heat and humidity, then worked out what that meant at room conditions. About 70% of the discs were estimated to last more than a century, and about 4% to fail within ten years. Its own conclusion is the honest one: results like these show how hard it is to generalise about how long optical media last.

So the myth runs both ways. CDs don’t rot on a timer, and they aren’t guaranteed to last forever. Most pressed discs look stable; a minority fail early. In the Library’s shelf study, the discs that began with the most errors kept gaining them fastest, and handling damage made others jump. Storage counts too: by the Library’s estimate, a disc kept at 10 °C and 35% relative humidity could last around eleven times longer than one at 25 °C and 50%. You don’t need a cold room. You need to stay out of a hot, damp one.

Checking a disc needs a lamp and one full play. Hold it up to a strong lamp and look through it: points of light mean the metal has gone. Look over the printed side and the edge for discolouration or flaking. Then play it all the way through, because the player’s error correction hides early decay; a disc can sound perfect while it declines. If it skips, the CCI suggests trying another player or drive before you blame the disc. And if a disc matters to you and would be hard to replace, copy it while it still reads.

The paper in the case is not neutral

The booklet is where the credits live, and sometimes the only printed evidence of which edition you own. It’s easy to think of it as the passive part of the package. The history of one factory says otherwise.

Between 1988 and 1993, Philips & Du Pont Optical (PDO) pressed CDs at a plant in Blackburn, Lancashire, for labels including Hyperion, ASV, Unicorn-Kanchana, Pearl, Decca and Deutsche Grammophon. Years later, some of those discs began to turn brown. Hyperion’s published notice, reprinted in a 1997 bulletin of the International Association of Sound and Audiovisual Archives, said the plant had acknowledged using a lacquer that could not withstand the sulphur in the paper of the CD booklets and inserts. The booklet, sitting in the same case for years, had been slowly corroding the disc it described.

The explanation was argued over at the time. Peter Copeland of the British Library’s sound archive thought silver in the reflective layer, reacting with sulphur compounds in the packaging, was the more likely cause, and noted the problem was first seen on CD singles in paper sleeves. Either way, paper and disc were reacting with each other.

You can check your own shelf. Most affected discs carry “Made in UK by PDO” around the centre hole. Hyperion described the symptom as a coppery-bronze discolouration starting at the outer edge of the printed side, heard first towards the end of the disc as a rhythmic noise like record surface noise. Don’t mistake it for the even yellow tint common to all PDO pressings, which comes from a dye added to the plastic for cosmetic reasons.

This was one plant’s defect, not a property of every CD. But NIST reaches a gentler version of the same idea independently. For long-term storage, it suggests it “may sometimes be prudent” to move the booklet outside the case, because paper can attract moisture into the case and spread it by contact with the disc. It is careful to say this rests on no specific tests and matters most with a lot of paper and humidity above the recommended range. For an ordinary room, the honest reading is: leave the booklet where it lives, and keep the room dry.

The booklet is the fragile part now

For a pressed CD in a normal room, light is barely a factor. NIST says the effect of ordinary room lighting on read-only discs is thought to be so small that it isn’t counted in their lifetime. The booklet and the spine of the tray card are another matter. The CCI’s guidance on paper notes that highly sensitive inks and dyes can fade noticeably within one to ten years under dim 50-lux lighting that still contains UV, at 3,000 hours of light a year. A shelf opposite a sunny window fades the spines you read every day, while the discs behind them carry on regardless.

Damp is worse. The CCI asks for relative humidity below 65% for paper, and says prolonged periods above 75% invite mould. The timescales are short: mould can take hold in two days at 90% humidity, or about ten at 80%. High moisture also cockles paper and makes ink bleed.

Compare that with the disc. In a NIST test, a CD that spent 24 hours under clean water was unreadable straight afterwards, then played normally after 24 hours drying at room conditions. Clean water is the kindest case, and NIST notes that other liquids can leave residue behind. Still, the disc recovered from a soaking that would cockle a booklet and make its ink bleed.

Handle the paper accordingly. The small tabs in a jewel-case lid are known to grip booklets tightly enough to tear them, so ease a booklet out rather than pulling it by the spine, and don’t force a thick one back into a case that was never meant to hold it. Keep adhesive tape, paper clips and rubber bands away from it; the CCI lists all three among the materials that damage paper.

A case is a part, not the album

A standard jewel case is a three-piece polystyrene box, 142 by 125 by 10 millimetres, whose brittle hinge arms often snap under shock and whose tray teeth break. That’s the bad news. The good news is that it’s standardised, so a cracked case is an easy swap. Discogs’ grading guidelines leave standard jewel cases out entirely, as our guide to record grading explains, because they’re replaceable.

Swap the case, then move the booklet and the tray card across, and keep anything that isn’t generic. A coloured or printed tray, a slipcase, an obi strip on a Japanese copy or a digipak are part of the edition, and cardboard can’t be replaced from a drawer. Before anything gets separated, note what the paper tells you: the catalogue number, the credits, and on older discs the SPARS code, which our piece on original, reissue and remaster explains. That’s the evidence of which edition you own.

Space-saving wallets are a trade. The CCI advises against plastic and paper sleeves in archives because they offer no physical protection and can scratch or contaminate the disc, and specifically warns that PVC sleeves shed plasticiser onto it. If you go that way anyway, choose polypropylene rather than PVC, keep the booklet and tray card filed with their disc, and try it on a shelf of ordinary albums before you commit the whole collection.

The shelf itself

The advice here is short and consistent across sources. NIST says store discs upright, like books, in cases made for them, and not flat in piles for years. The CCI puts the cases on their edges, away from direct light, in a room between −10 and 23 °C at 20 to 50% relative humidity, and asks you to avoid rapid swings, which can make the layers of a disc separate. NIST’s figure for a long-term archive is 18 °C and 40%.

At home that translates to a room you live in. Not the loft, not the garage, not the cellar, and not the windowsill. Leave enough slack in each row that one case slides out without dragging its neighbours, and give box sets their own shelf so you aren’t searching the album run for a disc that lives inside something else.

The last habit is the one that decides the rest: put the disc back in its case when it comes out of the player. NIST lists it among the basics. If you catalogue in Record by Record, each copy has a notes field, a good place to record where each box set and oversized edition lives, so the shelf and the catalogue agree.