This message is from the T13 list server.
On Thu, 21 Mar 2002 14:09:00 -0700, Pat LaVarre wrote: >This message is from the T13 list server. >>> Hale Landis 03/21/02 11:27AM >>> >>> Can anyone answer... >>> Do USB-to-ATA bridges support R/W LONG? >>> Do 1394-to-ATA bridges support R/W LONG? >I'm not sure I understand the question ... I think I remember in Scsi r/w >long is a standard device design OPTION, not a standard device feature. So by >people can only answer device by device whether they chose to implement the >option or not? I don't care if it is an option or optional or even vendor specific in SCSI. My question is has anyone seen an X-to-ATA bridge that supports some command on the X side that converts into an ATA READ or WRITE LONG command? >Any fully transparent Usb-to-Atapi bridge, or a fully transparent Ata over >whatever bridge, supports r/w long together with everything else possible, by >the definition of "fully transparent". Perhaps but in the case of R/W LONG the bridge would need to know how many ECC bytes and how to transfer those ECC bytes on the ATA side. >I did see that the last two Usb-to-Ata and 1394-to-Ata devices that I touched >in detail personally (Summer, 2001) translated optional Scsi ops x3E/3F >Write/Read Long to Ata ops x23/33 Read/Write Long after getting Ata op xEF:44 >SetFeatures VendorUniqueLongBlockLength to pass and fetching xEC Identify data >to discover the VendorUniqueLongBlockLength. OK, so there is at least one USB-to-ATA bridge that supports ATA R/W LONG. >>> Do 1394-to-ATA bridges support R/W LONG? I have never seen one. >Did you mean you have never seen a 1394 to Ata bridge or did you mean to say >you know of bridges that do not pass thru Read/Write Long? I have seen several 1394-to-ATA/ATAPI bridges. None have supported ATA R/W LONG (or the support was not documented). >>> Does "serial ATA" support the ATA R/W LONG command protocol? >I'm even more stunningly ignorant of Ata than I am of serial Ata ... so I'm >sure I don't really know what this query means. >Serial Ata is a bridge design, yes? I don't know... I have never seen the specification. I was just curious if anyone could answer the question... The apparent lack of an answer must mean the secret society's NDA is still in force and no one can talk about it in public. *** Hale Landis *** www.ata-atapi.com ***
