PS2 Buying Guide: Fat vs Slim and What to Check
The PlayStation 2 is one of the easiest retro consoles to get running again, partly because so many were made and partly because most of what goes wrong with them is mechanical rather than mysterious. The main decision is which shape of console to buy: the original chunky "fat" design, or the later slimline. Neither is objectively better. They fail in different ways and support slightly different accessories, so it is worth knowing what you are choosing between before you hand over money for a used unit.
Fat versus slim: the practical differences
The original fat PS2 has an internal power supply, so it runs from a standard mains lead. It also has a rear expansion bay, which is where the official network adapter and internal hard drive were fitted. If you care about the small number of games that supported the hard drive, or you want the tidiest setup with one cable, the fat is the one to look at.
The slim dropped the expansion bay and the internal hard drive support, but added a network port on the console itself. It runs from an external power brick, which is a real consideration on the used market: bricks get separated from consoles and swapped around. Only use a supply whose ratings match what is printed on the console, and do not substitute a generic laptop or router adapter. A mismatched supply is one of the few ways to kill a PS2 outright.
Mechanically, the fat uses a motorised disc tray and the slim uses a manual top-loading lid. Trays wear out and stop opening reliably. Lids rely on a small sensor that tells the console the lid is shut. Both are common age-related faults.
Disc read errors: what is real and what is not
The PS2's reputation for disc read errors is earned, but it is often misunderstood. The drive uses one laser assembly with two diodes: one for CD-based discs and one for DVD-based discs. That means a console can happily play DVD-based games and refuse every CD-based game, or the reverse. Over time the laser weakens and the sled that moves it across the disc wears, particularly on fat models where the rails and gears are plastic.
Two pieces of folk advice are worth ignoring. The first is turning the potentiometer on the laser to "boost" it. It can produce a few weeks of working discs and then a dead laser, and it makes a fixable console harder to fix. The second is taping down the lid sensor on a slim so it always reads as closed. That defeats a safety interlock and lets a disc spin at full speed with the lid open.
If a console genuinely needs a new laser assembly, a new tray belt, or a repaired sled, that means opening the case and in some cases soldering. That is beyond a basic clean and is best handled by someone comfortable with the work, not attempted as a first repair.
What to check before you buy
- Both disc types. Test a DVD-based game and a CD-based game (the ones with a blue underside). Passing one does not mean it will pass the other.
- The tray or lid. On a fat, the tray should open and close smoothly without being nudged. On a slim, check the lid closes flush and the console recognises it.
- Both controller ports and both memory card slots. Ports do fail individually.
- USB ports, if you plan to use light guns, adapters, or peripherals that rely on them.
- The AV multi-out. Check the connector is not loose and that the picture is stable when the cable is wiggled.
- Noise and heat. A loud grinding from the drive during loading usually means sled or spindle wear.
- Region. PS2 game discs are region locked, and DVD films follow DVD region coding. A Japanese console will not play a European game disc without modification.
Memory cards and saves
PS2 saves need an official-style 8MB PS2 memory card. Very high-capacity third-party cards exist and have a long history of corrupting saves, so they are worth avoiding. The console's card slots accept both PS2 and PS1 cards, but the two formats are not interchangeable in use: a PS2 game cannot save to a PS1 card, and a PS1 game cannot save to a PS2 card. If you plan to play both, budget for one of each.
PlayStation 1 backwards compatibility
Every retail PS2 plays PS1 discs, which is a large part of the appeal. The same laser caveat applies, since PS1 discs are CD-based. If you are building a library that spans both, it is worth testing the console with a PlayStation 1 game as well as a PS2 title before you commit. The system configuration menu on most units includes options that affect PS1 disc playback, such as disc speed and texture smoothing; if an older game misbehaves, try switching those back to their defaults.
Cleaning and care that will not cause damage
Clean discs with a soft, lint-free cloth, wiping from the centre straight out to the edge rather than in circles. Do not breathe on a disc to fog it first, and do not blow into memory card slots, controller ports, or the open drive. The advice about blowing into cartridges to make them work applies here too, and it was always bad advice: the moisture in your breath accelerates corrosion on contacts, and on a disc it simply spreads whatever was already there.
For memory cards and controller connectors, a cotton swab lightly dampened with 99% isopropyl alcohol, left to dry fully, is safe. Keep vents clear and give the console room to breathe, especially the fat, which shifts a lot of air. Leave the internal power supply alone entirely; there is mains voltage in there.
If you want the widest accessory support and a single power cable, take the fat. If you want something small that will fit in a bag, take the slim and make sure the correct power supply comes with it. Either way, judge the individual console on how it reads discs rather than on which shape it is.
