Those Disk 3½" & 5¼" Floppy Disc Drives are not the original Amstrad standardyet the media and drives were far cheaper so they were common especially when used as a 2nd drive.
Yet they During the lifetime of the CPC both drives were far advertised in UK magazines with the 3½" becoming much more cheap common in it's later years due to it's use in the PC. In Germany 5¼" were advertised and are nowadays easier well supported by Vortex for much longer. Magazines also promoted the use of these drives especially with the use of another DOS or C/PM to be able to usetheir full capacity.
Especially the Both 3½" (3& 5¼"1/2 ?) as those disk are still availlable in some retailers. You can also easily find such drives in any garbage if you properly scavenge old rusty computerswere often double sided and supported double density and high density although the Amstrad could only support Double Density.
Those Disk size couldn't be side switched manuallyNowadays the 5¼" drives are hard to find and are expensive, media is not made anymore and new-old-stock media is also hard to find.The older models where using only one side (360 Ko ?)By double side (DD) or even High Density where available3½" drives can be found from old PC computers and there is still a read supply of new-old-stock media.
==Formats ==Increasingly however it is often easier to use a disc drive emulator or one of the devices that can run games from SD cards.
3"1/2==Comparison of media costs==
*DD = 720ko3" disc (each) - £3.99*HD : 1,44 Mo3.5" disc (each) - 50p5.25" disc (each) - 50p
5"1/4==Usage of Media==
*er...I don't remember (editors please ?)*1,2 Mo was To make full use of the maximum...capacity of the media you need to use another DOS or C/PM on my old PC.your CPC which can support more tracks and two sides.Then you can use around 720KB per disc.
Without another DOS you can still use some of the capacity:
* 3½" discs can't be turned like 3" discs therefore with [[AMSDOS|AMSDOS]] you can use a manual side switch to choose the sides giving 2 x 178KB per side. Without the side switch it's just 178KB. Using discs like this back in the day was still useful as the media was cheaper.
* 5¼" discs can be turned over like a 3" and you can write both sides if you cut a write protect hole on the other side of each disc OR like the 3½" a manual side switch can be used.
[[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]]
==Scavenged 3½"==
It is worth noting that 3½" scavenged from PCs will lack the drive selection and ready signal. Often these drives will need a modification to make them useable OR you can make sure the drive motor is always on.
==Common PC Formats ==
3½":
*DD = 720KB
*HD : 1,44 MB
5¼":
*DD = 360KB
*HD = 1.2MB
== Beware : HD ==
Nowaday, only HD 3the most common 3½"1/2 disk is HD. These can be found at good as used or new old retailer'sstock on auction sites.
But or our beloved CPC can't understand easily the concept of High Density Disk with 1,44Mo avalaible44MB available... so you have to cheat to use the media: just put some opaque duct-tape (scotch-tape, whatever...) on the HD Hole.
So you have to cheat : just put some duct-tape (scotch-tape, whatever...) on the HD Hole.Tada, a proper the drive will think DD disk with 720 Ko if your OS allows media is used and now it.Or a common 2x180Ko (2x 178Ko ?) with firmware Loco Basic, if you have a manual side switcher button too of course)'s usable.
PC users used to do the opposite : cut/drill a HD hole on DD disk...this worked well sometimes.
PC users used You can also modify your HD drive to do the opposite : file behave as a HD hole on DD diskone (but this would be permanent of course)...this worked well sometimes.Check for appropriate jumpers on your drive!
== A clever choice ==
A great advantage at the time (in the 80's) was to get access to CP/M sofware library, as most of those were on such DiskFloppy Disks.
Also, the Disk those Floppy Disks were far cheaper than the exotic 3", but...few CPC users actually got own such drives.
Mostly professionnal users...The common snotling Gamer couldn't even dream of this(nor even knew it possible)...until nowadays.
As the magnetic disk is bigger...well the format is bigger too.
It is common to get 720Ko 720KB disk (using the 2 sides, so 80 tracks)
Many Modern CPC users replace their old 3" by an external 3"1/2, adding a Disk drive A-B / B-A switcher (allowing to use the external disk Drive as if it were the internal one = Drive A).= Software's issues ==
Also a side switcher allows to use a 3"1/2 disk like a 3" disk... switching manually the sides as needed by good old 3" disk drives (yet a decent sofware can do it).
== Softwares released on 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 diskDrive 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 [[Orion PrimeAMSDOS|AMSDOS]]This pure awsomness even use a full DD disk's 80 tracks with more than 700Ko of Data, yet you have to get a proper DD disk Drive), as some older models may lack this 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.
But modern software designers can allow this fairly easily.
Orion Prime uses the Double side feature, enabling a simple 720KB disk with no manual side switches.
Rick Dangerous 128+ (1.1 add-on) seems to allow the game to be loaded from the B drive.
It is up to the CPC-scene to design their software to include those options, allowing more un-modded drives to be simply used as external B drives with no need to add extra buttons and cable assemblies on the Amstrad.
As modifying all the software library of the good old times seems impractical, yet modern era software have to use this.
== Software released on 3.5" disk==
* [[Orion Prime]] - This pure awsomeness even uses a full DD disk's 80 tracks with more than 700KB of Data, but you have to have a proper DD disk drive, as some older models may lack this feature...
== Software released on 5.25" disk==
* [[Data Media]] released several software titles for use with their [[Data Media Disc System]]
== Non 3" CPC disk drives ==
*any scavenged rusty junk may be good enough nowaday, if you have a 664 or 6128...
==GuideConnections and Wiring == [[DIY:Floppy_Drives]] == Guides ==
[[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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[[Category:Hardware]][[Category:Peripherals]][[Category:DATA Storage]]