Double side (DD) or even High Density were available.
[[image:3.5.jpg|200px|thumb|Internal 3.5" drive]]
[[image:5,25_cable.jpg|200px|thumb|advertisement for 5,25" drive cable for CPC in 1990]]
5"1/4
*er...I don't remember (editors please ?)360KB*1,2 Mo was the maximum...on my old PC...2MB
Nowaday, only HD 3"1/2 disk can be found at good old retailer's.
But or our beloved CPC can't understand easily the concept of High Density Disk with 1,44MB available...
So you have to cheat : just put some duct-tape (scotch-tape, whatever...) on the HD Hole.
Tada, a proper DD disk with 720 KB (if your OS allows it).
Or a common 2x178KB with [[AMSDOS |AMSDOS]] (stock CPC firmware) - if you have a manual side switcher button of course to read second side of disk.
PC users used to do the opposite : file a HD hole on DD disk...this worked well sometimes.
Many Modern CPC users replace their old 3" with an external 3"1/2, often adding a Disk drive A-B / B-A switcher (allowing the use of an external disk Drive as if it were the internal one = Drive A) and/or a side switcher to allow the use of a 3"1/2 disk like a 3" disk... switching manually the sides as needed by good old 3" disk drives (yet a decent software can do it).
The side switcher and A-B drive's switchers are needed only if you use old software (using [[AMSDOS|AMSDOS]]), as most of them couldn't really figure they were loaded from B drives, or had no such feature as double sided drives.
They were designed for good old 3" drive so the 720KB DD external 3"1/2 is not implemented.
*any scavenged rusty junk may be good enough nowaday, if you have a 664 or 6128...
==GuideGuides ==
[[Guide on how to connect a 3.5]]<br>
[[Guide on how to connect a 3.5" drive to a CPC6128/664]] with photos
[[Amstrad Computer User]] magazine published a two-page guide on how to connect a 5.25" drive to a CPC 464:
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image:ACU8505-085.jpg
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[[Category:Hardware]][[Category:Peripherals]][[Category:DATA Storage]]