IDE Secondary Channel use for dvd and hdd drives (with no performance loss)

vbimport

#1

Ok so it is all sata hdd now, I still have to catch up don’t have any sata drives as yet. Will do when the bdxl optical drives from all manufactures are made and flooding the pc market.

Until then I need to connect another hdd to pc. Which will have to be placed on the secondary ide channel as all other slots have drives attached to them. I remember long ago when I last tried this there was a performance hit on writing dvd disc back then producing coasters. Only then when disconnected the hdd all was back to normal and no more coasters at same rate. Today many years later the results different. Only difference being a different pc now p4 back then p3 (p3 now for internet use). The tests I have done here do prove what ata-2 specification says. Which goes against what can be read all over the web for the same subject where is said don’t do it as will not work. Where people will still post that same information, but haven’t tested since first reading or trying this more recently.

Tests carried out writing a 4,206,952,448 bytes file to a dvd writer using batch of discs from same stack. Each disc looked at in daylight before write for any graze marks deformities etc they all seem ok.

These Sony discs are notoriously bad for been just that ‘bad’. The Sony disc problems comes from the foam spacer at top of each tub dvd stack when new. Which isn’t thick enough to stop any discs from rotating during transportation and shipping and carrying. The top three to five discs and bottom discs of stack always bad and are grazed or scratched. More often many more in the stack will be the same. Even have found human hairs in between discs. Sure they wear hair nets and keep dvd production areas clean. Least that is how it was previously shown on tv and videos. Nice to have tubs for disc storage don’t go the plastic wrapped dvd stack route. Better if Sony could manufacture so they discs didn’t move. Here Sony you have been told, take this for reason of poor sales or why sales are not greater than like them to be.

In all tests I used same version of ImgBurn was used to burn the file. Test a and b are write file from hdd connected on secondary device interface. And b from another drive on a (non raid) hdd controller (pci), fastest drive I have and speed test at around 70mb/s. Usual as indicator of KB/s how much they vary and if make any difference which way round master and slave is on secondary. Also as writing including a test with only dvd drive connected as master and file from this other drive on separate (non raid) hdd controller interface (pci).

IDE Secondary device
cable = 80 wire ide cable

Test 1a
HDD ide secondary set slave on cable end connection
DVD ide secondary set master on cable middle connection

Average Write Rate 13,973 KB/s (10.1x)
Maximum Write Rate 21,162 KB/s (15.3)

Average Verify Rate 14,778 KB/s (10.7x)
Maximum Verify Rate 21,101 KB/s (15.2x)

Test 1b
HDD ide secondary set slave on cable end connection (not used in test 1b)
DVD ide secondary set master on cable middle connection
HDD set master (another drive on a pci ide controller device) (used in test 1b)

Average Write Rate 14,215 KB/s (10.3x)
Maximum Write Rate 21,136 KB/s (15.3)

Average Verify Rate 14,831 KB/s (10.7x)
Maximum Verify Rate 21,130 KB/s (15.3x)

Test 2a
HDD ide secondary set master on cable middle connection
DVD ide secondary set slave on cable end connection

Average Write Rate 13,740 KB/s (9.9x)
Maximum Write Rate 21,127 KB/s (15.3)

Average Verify Rate 14,831 KB/s (10.7x)
Maximum Verify Rate 21,083 KB/s (15.2x)

Test 2b
HDD ide secondary set master on cable middle connection (not used in test 2b)
DVD ide secondary set slave on cable end connection
HDD set master (another drive on a pci ide controller device) (used in test 2b)

Average Write Rate 14,118 KB/s (10.2x)
Maximum Write Rate 21,110 KB/s (15.2)

Average Verify Rate 14,831 KB/s (10.7x)
Maximum Verify Rate 21,162 KB/s (15.3x)

Test 3
HDD ide secondary (disconnected both power and cable connection - not available)
DVD ide secondary set master on cable middle connection
HDD set master (another drive on a pci ide controller device)

Average Write Rate 14,215 KB/s (10.3x)
Maximum Write Rate 21,127 KB/s (15.3)

Average Verify Rate 14,831 KB/s (10.7x)
Maximum Verify Rate 21,127 KB/s (15.3x)

ATA-2 specification draft d0948r4c-ATA-2.pdf

Working Draft
X3T10/0948D
Information Technology -
AT Attachment Interface with Extensions (ATA-2)
Revision 4c
March 18, 1996

4.1 Configuration
This standard defines the ATA interface containing a single host or host adapter and one or two devices. If
two devices are connected to the interface, they are connected in a daisy chained configuration. One device
is configured as Device 0 and the other device as Device 1.
The designation of a device as Device 0 or Device 1 may be made in a number of ways:
- a switch or a jumper on the device
- use of the Cable Select (CSEL) pin

In a two drive configuration, the order of placement of Device 0 and Device 1 on the ATA interface cable is
not significant to the operation of the interface.

If only a single device is attached via the ATA interface to a host, it is recommended that the host and the
device be placed at the two ends of the cable.


#2

Thanks for your tests. :clap:
Proves, it does not matter where to connect a drive, basically.

Sometimes, it depends on the drive itself what position is selected (unfortunately, standards are often partially ignored), and on the cable routing options of the computer.

Michael