AFAIU it has become a habit to enlarge your install floppy size :)

$ uname -a
NetBSD NBSD1 4.99.3 NetBSD 4.99.3 (NBSD1) #0: Fri Nov 10 15:54:37 NOVT 
2006  toor@NBSD1:/usr/src/sys/arch/i386/compile/NBSD1 i386

/usr/src completely updated from yesterday's CVS.

--- cut ---
#    create  bootfloppy/boot (from: /usr/build/dest/usr/mdec/boot)
#    create  bootfloppy/netbsd (from: 
/usr/build/obj/distrib/i386/instkernel/netbsd-INSTALL.gz)
gunzip -c /usr/build/obj/distrib/i386/instkernel/netbsd-INSTALL.gz > 
netbsd.tmp
/usr/build/tools/bin/i386--netbsdelf-strip -R .comment -R .ident netbsd.tmp
gzip -9c netbsd.tmp > netbsd; rm -f netbsd.tmp
#    create  bootfloppy/boot1.fs (from: boot  netbsd)
PAX=/usr/build/tools/bin/nbpax /bin/sh 
/usr/src/distrib/common/buildfloppies.sh  -i 
"/usr/build/tools/bin/nbinstallboot  -mi386 @IMAGE@ 
/usr/build/dest/usr/mdec/bootxx_ustarfs" -p  -m 3 -s .fs  boot 2880 boot 
  netbsd
Running instboot: /usr/build/tools/bin/nbinstallboot -mi386 
floppy.19132.tar /usr/build/dest/usr/mdec/bootxx_ustarfs
Free space in last tar block: boot 236, netbsd 511,
Writing 4423680 bytes (4320 KB) on 3 disks, padded by 1458176 bytes 
(1424 KB)
Creating disk 1 to boot1.fs
Creating disk 2 to boot2.fs
Creating disk 3 to boot3.fs
0+1 records in
1+0 records out
1474560 bytes transferred in 0.025 secs (58982400 bytes/sec)
Final result:
-rw-r--r--  1 root  wheel  1474560 Nov 14 01:30 boot1.fs
-rw-r--r--  1 root  wheel  1474560 Nov 14 01:30 boot2.fs
-rw-r--r--  1 root  wheel  1474560 Nov 14 01:30 boot3.fs
all ===> etc/i386/floppies/bootfloppy-big
#    create  bootfloppy-big/boot (from: /usr/build/dest/usr/mdec/boot)
#    create  bootfloppy-big/USTAR.volsize.13200
#    create  bootfloppy-big/netbsd (from: 
/usr/build/obj/distrib/i386/instkernel/netbsd-INSTALL.gz)
gunzip -c /usr/build/obj/distrib/i386/instkernel/netbsd-INSTALL.gz > 
netbsd.tmp
/usr/build/tools/bin/i386--netbsdelf-strip -R .comment -R .ident netbsd.tmp
gzip -9c netbsd.tmp > netbsd; rm -f netbsd.tmp
#    create  bootfloppy-big/boot-big1.fs (from: boot USTAR.volsize.13200 
netbsd)
PAX=/usr/build/tools/bin/nbpax /bin/sh 
/usr/src/distrib/common/buildfloppies.sh  -i 
"/usr/build/tools/bin/nbinstallboot  -mi386 @IMAGE@ 
/usr/build/dest/usr/mdec/bootxx_ustarfs" -p  -m 1 -s .fs  boot-big 5760 
boot USTAR.volsize.13200 netbsd
Running instboot: /usr/build/tools/bin/nbinstallboot -mi386 
floppy.9254.tar /usr/build/dest/usr/mdec/bootxx_ustarfs
Free space in last tar block: boot 236, netbsd 511,
buildfloppies.sh: Image is 1023 bytes (0 KB) too big to fit on 1 disk

*** Failed target:  boot-big1.fs
*** Failed command: PAX=/usr/build/tools/bin/nbpax /bin/sh 
/usr/src/distrib/common/buildfloppies.sh -i 
"/usr/build/tools/bin/nbinstallboot -mi386 @IMAGE@ 
/usr/build/dest/usr/mdec/bootxx_ustarfs" -p -m 1 -s .fs boot-big 5760 
boot USTAR.volsize.13200 netbsd
*** Error code 1

Stop.
nbmake: stopped in /usr/src/distrib/i386/floppies/bootfloppy-big

*** Failed target:  all-bootfloppy-big
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1"; 
shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .) 
this="etc/i386/floppies/"; real="/usr/src/distrib/i386/floppies" ;; *) 
this="etc/i386/floppies/${dir}/"; 
real="/usr/src/distrib/i386/floppies/${dir}" ;; esac; show=${this:-.}; 
echo "${target} ===> ${show%/}${1:+ (with: $@)}"; cd "${real}" && 
/usr/build/tools/bin/nbmake _THISDIR_="${this}" "$@" ${target}; }; 
_makedirtarget bootfloppy-big all
*** Error code 1

Stop.
nbmake: stopped in /usr/src/distrib/i386/floppies

*** Failed target:  all-floppies
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1"; 
shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .) 
this="etc/i386/"; real="/usr/src/distrib/i386" ;; *) 
this="etc/i386/${dir}/"; real="/usr/src/distrib/i386/${dir}" ;; esac; 
show=${this:-.}; echo "${target} ===> ${show%/}${1:+ (with: $@)}"; cd 
"${real}" && /usr/build/tools/bin/nbmake _THISDIR_="${this}" "$@" 
${target}; }; _makedirtarget floppies all
*** Error code 1

Stop.
nbmake: stopped in /usr/src/distrib/i386

*** Failed target:  all-i386
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1"; 
shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .) 
this="etc/"; real="/usr/src/distrib" ;; *) this="etc/${dir}/"; 
real="/usr/src/distrib/${dir}" ;; esac; show=${this:-.}; echo "${target} 
===> ${show%/}${1:+ (with: $@)}"; cd "${real}" && 
/usr/build/tools/bin/nbmake _THISDIR_="${this}" "$@" ${target}; }; 
_makedirtarget i386 all
*** Error code 1

Stop.
nbmake: stopped in /usr/src/distrib

*** Failed target:  snap_post
*** Failed command: cd /usr/src/distrib && /usr/build/tools/bin/nbmake 
depend && /usr/build/tools/bin/nbmake && /usr/build/tools/bin/nbmake release
*** Error code 1

Stop.
nbmake: stopped in /usr/src/etc

*** Failed target:  release
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1"; 
shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .) this=""; 
real="/usr/src" ;; *) this="${dir}/"; real="/usr/src/${dir}" ;; esac; 
show=${this:-.}; echo "${target} ===> ${show%/}${1:+ (with: $@)}"; cd 
"${real}" && /usr/build/tools/bin/nbmake _THISDIR_="${this}" "$@" 
${target}; }; _makedirtarget etc release DISTRIBUTION_DONE=1
*** Error code 1

Stop.
nbmake: stopped in /usr/src

ERROR: Failed to make release
*** BUILD ABORTED ***
--- cut ---

// wbr