Kurt Garloff <[EMAIL PROTECTED]> writes:
[Tandberg SLR4DC "TDC 4222" does not negotiate SYNC with Tekram DC-390U]
> G�rard has to help you. I don't know about a bug in the DC390 BIOS
> misreporting speeds. The reason for the message, that your target does not
> report sync might be:
> * The device is buggy and does not answer with a corrected SDTR message, but
> refuses it, if more than 4MB/s are suggested by the initiator.
The drive inquiry data was wrong. A firmware update fixed the problem.
> * The driver does not support sync speeds below 5MHz, as they don't make
> sense anyway. With async. transfers, you can get 5MB/s (and a little bit
> more, if your driver uses aggressive timing).
I have no clue, since I haven't tried to write to the drive's buffer
aggressively (is there a tool to check transfer speeds if the buffer
size is known, 256 kB in this drive?).
I somehow recalled drive specifications of 3 MB/s async and 5 MB/s sync,
but this may well be related to sluggish Adaptec ISA stuff such as ISA
AHA1542CF along with crappy Yamaha CD writers (CDR-200/400 series) and
not be up-to-date information.
Anyways, since the firmware update the driver negotiates 4 MB/s,
8-byte-per-handshake transfers.
See my reply to G�rard's posting for further details.
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