Windows can't see beyond 4 speed CDRom?

[Manx]

My Computer\Properties\Performance\File System\CDROM
The highest selection possible is quad speed or more!! Surely in this day of 32 and 40 speed CDRoms this cant be right. Or does it make no difference to Windows what speed your CDRom is?

[vfrxsw]

This is normal just set to quad speed or higher

[Beemer]

There is a way of improving the speed.

There are two hex (binary) or on some older Win95 (retail) machines DWORD
values, you can change to speed up your cd-rom/dvd access, under this
Registry key (maximum values allowed by Windows shown here):


The hex values:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\contro l\FileSystem\CDFS
"CacheSize"=hex:6b,02,00,00
"Prefetch"=hex:e4,00,00,00


The DWORD values:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\contro l\FileSystem\CDFS
"CacheSize"=dword:0000026b
"Prefetch"=dword:000000e4

To do this you need to run Regedit.
If you choose to do this manually, it may take some time to become familiar
with the way the hex and DWORD values work and how to modify them properly.
The table below shows all the "CacheSize" and "Prefetch" values you need to
modify for cd-roms/dvds of different speeds, starting with 4x (maximum allowed
by Windows) and up to 48x: [high enough for you?! ]


CD-ROM/DVD "CacheSize" Registry values:

Cache Size Decimal | KB Hex DWORD
--------------------------------------------------------
Small [Default] 619 | 1238 6b,02,00,00 0000026b
Medium 1238 | 2476 d6,04,00,00 000004d6
Large 2476 | 4952 ac,09,00,00 000009ac

CD-ROM "Prefetch" Registry values:

CD-ROM Speed Decimal Hex DWORD
--------------------------------------------------------
4x [Default] 228 e4,00,00,00 000000e4
8x 448 c0,01,00,00 000001c0
16x 896 80,03,00,00 00000380
24x 1344 40,05,00,00 00000540
32x 1792 00,07,00,00 00000700
40x 2240 c0,08,00,00 000008c0
48x 2688 78,0a,00,00 00000a78
And a little "bonus": optimal read-ahead buffer size values for DVD drives:


DVD "Prefetch" Registry values:

DVD Speed Decimal Hex DWORD
--------------------------------------------------------
1x 448 c0,01,00,00 000001c0
2x 896 80,03,00,00 00000380
4x 1792 00,07,00,00 00000700
6x 3584 80,0a,00,00 00000a80
Larger cache/buffer size means using more memory (RAM). Make sure you
leave Windows with enough memory to operate properly (it's only a
trial-and-error game), especially if you're RAM "challenged".

Cheers!

[Bob The Great]

Or you can download Winboost. It can automate the whole proccess.

[Beemer]

But nowhere near as much fun as doing it manually....lol

Cheers!