Bug 243178

Summary:	newfs_msdos: wrong FAT type determination
Product:	Base System	Reporter:	Xin LI <delphij>
Component:	bin	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	New ---
Severity:	Affects Many People	CC:	emaste, nc
Priority:	---
Version:	CURRENT
Hardware:	Any
OS:	Any

Description Xin LI freebsd_committer

2020-01-08 08:40:06 UTC

Creating a bug so this is not lost.

The automatic FAT type determination is broken.

Reproduction case:

$ truncate -s 2147483648 test
$ newfs_msdos ./test
newfs_msdos: warning, ./test is not a character device
newfs_msdos: 65519 clusters too few clusters for FAT32, need 65525

Comment 1 Neel Chauhan freebsd_committer

2020-08-28 13:13:05 UTC

I believe the issue is the cluster detection mechanism (Line 334 to 351).

For instance, this works:

newfs_msdos -c 128 ./test

Comment 2 Neel Chauhan freebsd_committer

2020-08-28 13:13:44 UTC

The lines are in sbin/newfs_msdos/mkfs_msdos.c