RISC OS 3.7 User Guide

27 HForm

If your computer has a hard disc, it's supplied already formatted and loaded with the standard RISC OS applications. You'll only need to use this application if you fit a hard disc that has not been formatted, or if an existing hard disc develops a problem that can only be solved by formatting.

HForm only formats IDE drives. If you have a SCSI drive, refer to the guide supplied with your SCSI Expansion Card. This computer does not support ST506 disc drives.

WARNING: Formatting your hard disc will permanently remove all data stored on the disc. It is essential that you copy all the data and applications that you want to keep to floppy discs (or otherwise back them up) before you reformat the disc.

WARNING: Save your work and quit all applications before using HForm.

You should keep a spare copy of !HForm on floppy disc in case your hard disc becomes unusable.

Formatting your existing hard disc

HForm allows you to leave the program at any time by pressing Esc before you start formatting. Additionally, at the end of the Format options you will be asked if you want to proceed with the formatting; answer No and HForm will quit without formatting your disc.

Starting the application

Using HForm

1 First, tell HForm which drive you want to format:

Format which drive (4 - 7)? 4 Return

If you want to accept the default drive number 4, press Return, otherwise type the desired number and press Return. HForm checks the type of hard disc and displays message similar to this:

Drive 4 is an IDE drive

IDE drive ADFS:4 identifies itself as:

Description : Conner peripherals 240MB - CP30254

Firmware version : 0.33

Configuration : 895 cylinders, 10 heads and 55 sectors/track

2 Next, tell HForm which hard disc shape to use.

This disc supports the LBA (Logical Block Address) option *

This disc was last formatted using the standard shape:

895 cylinders, 10 heads and 55 sectors/track

Parking cylinder 894, Initialisation flag 1,

LBA flag 1(enabled) Do you wish to retain this shape (Y/N)? Y Return

*The first line will only appear on discs that support the LBA option (see Changing the hard disc shape on page 362).

3 Decide whether you simply want to format the disc, or whether you want to map out any defects found. HForm gives you the following choices:

D: remove defect

If you want to add some defects see Recording a list of hard disc defects on page 361. If you are simply formatting a disc:

A, B, C or D? A Return

4 Decide whether to format or initialise the hard disc.

Format or just initialise the drive (F/I)? F Return

You only need to format the disc if it has never been formatted before, or if it was previously formatted using the wrong parameters. This example assumes you want to format the disc:

5 Decide whether you want to carry out a soak test.

Soak testing checks that the state of the defects on the disc is stable.

L is the long test; the disc is continuously tested until you press the Space bar. S is the short test, which is just one scan of the disc, lasting a few minutes.

6 You now have a final chance to quit the format process before it starts, or decide to proceed:

Entering Y and pressing Return starts the format or initialisation. Entering N will quit from the HForm application without formatting the disc.

If you specified the long soak test, the test continues until you press the Space bar. It is recommended that you carry out the soak test for at least 24 hours.

If you do not perform a soak test, and if the verification process detects any additional defects, HForm will then repeat the formatting and verification process in order to include the new defects. It will display the messages Formatting and Verifying as it does so.

7 At the end of the formatting process, you'll get one final prompt. Either accept the default file allocation unit of 512 by pressing Return, or enter a different amount and then press Return.

Large file allocation unit? <number>

The formatting process is now complete.

Recording a list of hard disc defects

HForm lists the current defects (if any) on the hard disc and invites you to change the list by adding any new defects that you may have discovered. You may wish to add a new defect because ADFS has previously returned an error message, such as:

Disc error 10 at :4/00831E00

You should make a note of any errors on your hard disc of this type that the computer reports.

When HForm asks you if you want to map out any defects:

1 Type C then press Return.

2 Type in the defect address exactly as it appeared in the disc error message, but omit anything up to and including the colon (e.g. for the error above, you'd just type 4/00831E00) then press Return.

3 When you have entered all the defects you wish to, type A and press Return to indicate there are no more changes.

Changing the hard disc shape

However, you may need to change the specifications of the hard disc format used (known as the shape) if

• you are adding a new hard disc

• the hard disc has not yet been formatted

• the information on the hard disc has been corrupted or is incorrect.

Do you wish to retain this shape (Y/N)? N (and press Return)

You will be presented with a list of alternative shapes to choose from. If you don't want to use any of these shapes use OTHER. You will have to enter the formatting specifications you require. Consult the manual accompanying your hard disc for its precise specifications or contact your supplier for details. Note: During this process, if your disc supports it, you'll be given the opportunity to specify Logical Block Addressing (LBA):

Drive LBA flag (0 disabled, 1 enabled))? 1 (and press Return)

LBA provides a faster calculation of disc addresses. If you don't set the LBA flag here, the normal Cylinder-Head-Sector (CHS) addressing will be used.