Editing LaserDisc (section)

=== Disadvantages ===
Despite the advantages over competing technology at the time (namely VHS and [[Betamax]]), the discs were heavy—weighing about {{convert|250|g|oz}} each—and cumbersome, were more prone than a VHS tape to damage if mishandled, and manufacturers did not market LaserDisc units with recording capabilities to consumers. Also, because of their size, greater mechanical effort was required to spin the discs at the proper speed, resulting in much more noise generated than other media.

The space-consuming analog video signal of a LaserDisc limited playback duration to 30/36&nbsp;minutes (CAV NTSC/PAL) or 60/64&nbsp;minutes (CLV NTSC/PAL) per side, because of the hardware manufacturer's refusal to reduce line count and bandwidth for increased playtime, (as was done in VHS; VHS tapes had a 3&nbsp;MHz video bandwidth, while LaserDisc preserves the full 6&nbsp;MHz bandwidth and resolution used in [[NTSC]] broadcasts). After one side finished playing, a disc had to be flipped over to continue watching a movie, and some titles filled two or more discs, depending on the film's runtime and whether or not special features are included. Many players, especially units built after the mid-1980s, could "flip" discs automatically (by rotating the optical pickup to the other side of the disc), but this was accompanied by a pause in the movie during the side change.

In the event the movie was longer than what could be stored on two sides of a single disc, manually swapping to a second disc was required at some point during the film (one exception to this rule was the Pioneer LD-W1, which featured the ability to load two discs and to play each side of one disc and then to switch to playing each side of the other disc). In addition, perfect still frames and random access to individual still frames was limited only to the more expensive CAV discs, which only had a playing time of approximately 30 minutes per side. In later years, Pioneer and other manufacturers overcame this limitation by incorporating a digital memory buffer, which "grabbed" a single field or frame from a CLV disc.

The analog information encoded onto LaserDiscs also did not include any form of built-in checksum or error correction. Because of this, slight dust and scratches on the disc surface could result in read errors which caused various video quality problems: glitches, streaks, bursts of static, or momentary picture interruptions. In contrast, the digital MPEG-2 format information used on DVDs has built-in error correction which ensures that the signal from a damaged disc will remain identical to that from a perfect disc right up until the damage to the disc surface prevents the laser from being able to identify usable data.

In addition, LaserDisc videos sometimes exhibited a problem known as "crosstalk". The issue could arise when the laser optical pickup assembly within the player was out of alignment or because the disc was damaged or excessively warped. But it could also occur even with a properly functioning player and a factory-new disc, depending on electrical and mechanical alignment problems. In these instances, the issue arose due to the fact that CLV discs required subtle changes in rotating speed at various points during playback. During a change in speed, the optical pickup inside the player might read video information from a track adjacent to the intended one, causing data from the two tracks to "cross"; the extra video information picked up from that second track shows up as distortion in the picture which looks reminiscent of swirling "[[barber pole]]s" or rolling lines of static.

Assuming the player's optical pickup was in proper working order, crosstalk distortion normally did not occur during playback of CAV-format LaserDiscs, as the rotational speed never varied. If the player calibration was out of order, or if the CAV disc was faulty or damaged, other problems affecting tracking accuracy could occur. One such problem was "laser lock", where the player read the same two fields for a given frame over and over, causing the picture to look frozen as if the movie were paused.

Another significant issue unique to LaserDisc involved the inconsistency of playback quality between different makers and models of player. On the majority of televisions, a given DVD player will produce a picture that is visually indistinguishable from other units; differences in image quality between players only becomes easily apparent on larger televisions, and substantial leaps in image quality are generally only obtained with expensive, high-end players that allow for post-processing of the MPEG-2 stream during playback.

In contrast, LaserDisc playback quality was highly dependent on hardware quality, and major variances in picture quality appeared between different makers and models of LaserDisc players, even when tested on low- to mid-range televisions. The obvious benefits of using high-quality equipment helped keep demand for some players high, while also keeping pricing for those units comparably high: in the 1990s, notable players sold for anywhere from US$200 to well over $1,000, while older and less desirable players could be purchased in working condition for as little as $25.

==== Laser rot ====
{{Main|Disc rot#Laser rot}}

Many early LaserDiscs were not manufactured properly. The adhesive that was used contained impurities which were able to penetrate the lacquer seal layer and chemically attack the metalized reflective aluminum layer, altering its reflective characteristics. This, in turn, deteriorated the recorded signal. This was a problem that was termed "laser rot" among LaserDisc enthusiasts (also called "color flash" internally by LaserDisc pressing plants). Some forms of laser rot could appear as black spots that looked like mold or burned plastic which caused the disc to skip and the video to exhibit excessive speckling noise. But, for the most part, rotted discs could actually appear perfectly fine to the naked eye.

Later optical standards have also been known to suffer [[Disc rot|similar problems]], including a notorious [[Compact disc bronzing|batch of defective CDs manufactured by Philips-DuPont Optical]] at their Blackburn, Lancashire facility in England during the late 1980s/early 1990s.