Solidisk Double Density DFS is now the ultimate in reliability and supported by the largest amount of software available for the Electron.

Solidisk relies on a good product and a large support network to win the heart of the user.

With over 75 Local Experts, covering England, Scotland and Wales, Solidisk can offer many users regional free fitting and advice.

With an ever increasing catalogue of free software, even users who are new to the Disc system can expect to build up a large library in a fairly short time.

Solidisk Software Support Service already has responsibility for over 50,000 BBC computer users and the ability to give you the best service matched only by the largest companies.

Solidisk Double Density DFS handles both BBC discs and Electron Discs, in single and double density whereas the ACORN PLUS 3 can only handle ADFS discs.

Solidisk ADFS has nice features such as automatic disc format sensing, built-in disc formatter and verifier and programmable disc speed.

It also has more than 20 disc utilities built into the ROM.

Standard features for both BBC DFS and Electron ADFS implementations include:

1. Automatic Write Error Correction.
2. Automatic 40/80 track stepping, the ADFS 2.1 will let you read and write 40 track discs if you have an 80 track drive.
3. Disc repair facilities.
   Disc sector editor (*DZAP), memory editor (*MZAP), recover good sectors (*RECOVER), rewrite multiple sectors (*RESTORE), read bad sectors and bad track (*RTRACK), repair and restore bad sectors and track (*WTRACK) and the powerful disc copy (*DCOPY) which is capable of duplicating even some non BBC discs.
4. Tape to disc facilities.
   Direct transfer from tapes to disc (*TAPEDISC) will work with all unprotected programs. *TAPELOAD and *TAPESAVE will cope with more difficult ones. Only in some cases (multipart games cassettes) will you need Solidisk tape copier.
5. Wordprocessing utilities.
   This facility allows *BOOT and other text files to be edited, saved and printed in any screen mode.
6. Automatic disc format sensing.
   On SHIFT-BREAK, the STL ADFS 2.1 will detect the disc format and use the right BBC DFS or Electron ADFS to run.

On the Electron ADFS side, the 2.1 ROM also has some very nice features:

1. Extensive Disc formatting facilities.
   *FORM40, *FORM80, *FORM160 and *WFORM (for the Winchester) are available to handle any disc drive.
2. Disc verifying facilities.
   *VERIFY will check all disc sizes including Winchester for media defects.
3. Number of opened channels.
   This is the star feature of Solidisk ADFS.
   This facility (*OPEN) allows you to specify how many files will be opened in a program, thus maximising the available RAM while avoiding buffer page swapping as on the Acorn ADFS.
   It leaves PAGE at &1900 for more programs, gives more room to VIEW and VIEWSHEET and avoids unnecessary conversion work for many programs originated for the BBC DFS to be run on your Electron.

On the BBC DFS side, the STL ADFS 2.1 handles both single and double density and in addition, it supports:

1. Unlimited catalogue entries.
2. Unlimited filesize.

- Electron User 2.12, September 1985