08584: c64 all versions: since verson 0.243 Formatting a disk takes very long

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08584	Media Support	Minor	Always	Mar 19, 2023, 18:59	Mar 24, 2023, 00:30

Tester	Walker	View Status	Public	Platform
Assigned To		Resolution	Open	OS
Status [?]	Confirmed			Driver	commodore/c64.cpp
Version	0.252	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	08584: c64 all versions: since verson 0.243 Formatting a disk takes very long
Description	Formatting a disk on the c64 took at best 2 min on the real hardware. Up to MAME 0.242 the time it took to format a disk image on the emulated device c64 was similar to the real hardware. Since MAME version 0.243 this Time has increased to 8-9 minutes - with enough patience a correct image is still created though (all supported media formats, .d64, .g64 and .mfi take the same amount of time to format an image). MAME 0.242 did not experience such a long time for formatting. The window freeezes after formatting sometimes, but after a few minutes the running emulation recovers and becomes responsive again. (Also in MAME 0.242)
Steps To Reproduce	Start the driver, insert a newly created disk image (or attach an existing) of any supported format in Basic Enter: (NAME can be up to 16 chars, additional chars are concatenated, ID can be any two digit alphanumerical - id is used by the drive firmware to detect disk changes) OPEN15,8,15,"N:NAME,01":CLOSE15 after formatting is finished you will get a READY Prompt
Additional Information
Github Commit

Flags
Regression Version	0.243
Affected Sets / Systems	c64 all versions

Attached Files

No.21194 Robbbert Senior Tester Mar 24, 2023, 00:30 edited on: Mar 24, 2023, 00:32	I don't know anything about Commodore computers having never owned one, but it does take a long time. I created a new MFI image. I timed it at 6 min 44 seconds. The fps counter dropped as low as 6% during this operation, and the disk sounds were slurred. Also, an extraneous line was drawn in the border area below the screen.