Heres the results of the plextors:
Plextor PX-230A
C:\cachex.exe -i -c d:
CacheExplorer 0.8 - spath@cdfreaks.com
Drive on D is PLEXTOR CD-R PX-230A 1.01
[+] Buffer size: 2048 kB, read cache is enabled
[+] Supported read commands: BEh
[+] Testing cache line size:
1345 kB / 586 sectors
6 kB / 3 sectors
no cache detected
1345 kB / 586 sectors
1350 kB / 588 sectors
1350 kB / 588 sectors
780 kB / 340 sectors
1348 kB / 587 sectors
1350 kB / 588 sectors
1350 kB / 588 sectors
C:\>C:\cachex.exe -i -. -c -m 10 -b 2 -n 1 d:
CacheExplorer 0.8 - spath@cdfreaks.com
Drive on D is PLEXTOR CD-R PX-230A 1.01
[+] Buffer size: 2048 kB, read cache is enabled
[+] Supported read commands: BEh
command A8h rejected
command 28h rejected
command D4h rejected
command D5h rejected
command D8h rejected
[+] Testing cache line size:
init 15000: 95.516059
15000: 0.946626
15001: 0.971098
15000: 0.972642
15003: 0.966764
15000: 0.975249
15005: 1.278869
15000: 0.986146
15007: 1.590191
15000: 0.971432
15009: 1.466104
15000: 0.974060
no cache detected
------dBpowerAMP R12------
5312ms without re-read and 5750ms with re-read
587 sectors
--------------------
Plextor PX708a
C:\>cachex.exe -i -c e:
CacheExplorer 0.8 - spath@cdfreaks.com
Drive on E is PLEXTOR DVDR PX-708A 1.12
[+] Buffer size: 2048 kB, read cache is enabled
[+] Supported read commands: BEh D8h
[+] Testing cache line size:
581 kB / 253 sectors
581 kB / 253 sectors
581 kB / 253 sectors
581 kB / 253 sectors
581 kB / 253 sectors
581 kB / 253 sectors
13 kB / 6 sectors
581 kB / 253 sectors
581 kB / 253 sectors
581 kB / 253 sectors
C:\>cachex.exe -i -. -c -m 10 -b 2 -n 1 e:
CacheExplorer 0.8 - spath@cdfreaks.com
Drive on E is PLEXTOR DVDR PX-708A 1.12
[+] Buffer size: 2048 kB, read cache is enabled
[+] Supported read commands: BEh
command A8h rejected
command 28h rejected
command D4h rejected
command D5h rejected D8h
command D8h with FUA bit rejected
[+] Testing cache line size:
init 15000: 67.844187
15000: 0.617817
15001: 0.525929
15000: 0.548503
15003: 0.640503
15000: 0.609329
15005: 0.539712
15000: 0.549165
15007: 0.629210
15000: 0.547930
15009: 0.556209
15000: 0.599586
no cache detected
------dBpowerAMP R12------
3844ms without re-read and 3844 with re-read
254 sectors
-------------------------
Retesting the PX230A on a different CD:
Drive on E is PLEXTOR CD-R PX-230A 1.01
[+] Buffer size: 2048 kB, read cache is enabled
[+] Supported read commands: BEh
command A8h rejected
command 28h rejected
command D4h rejected
command D5h rejected
command D8h rejected
[+] Testing cache line size:
init 15000: 92.982701
15000: 1.052926
15001: 0.958790
15000: 0.967066
15003: 1.589474
15000: 0.971994
15005: 2.216799
15000: 0.972971
15007: 2.172395
15000: 1.003475
15009: 0.994602
15000: 0.953897
no cache detected
C:\>cachex.exe -i -c e:
CacheExplorer 0.8 - spath@cdfreaks.com
Drive on E is PLEXTOR CD-R PX-230A 1.01
[+] Buffer size: 2048 kB, read cache is enabled
[+] Supported read commands: BEh
[+] Testing cache line size:
656 kB / 286 sectors
142 kB / 62 sectors
165 kB / 72 sectors
6 kB / 3 sectors
32 kB / 14 sectors
no cache detected
408 kB / 178 sectors
847 kB / 369 sectors
1274 kB / 555 sectors
803 kB / 350 sectors
I am beginning to think the 230A does cache. FUA clear does not work.