On 11-08-12 09:28 AM, joystick wrote:
Hi all IDE and SCSI ml's, is it guaranteed by the standards that reading from a device a region that has been TRIMmed (IDE) or UNMAPped (SCSI) will certainly return zeroes?
ATA: In 'hdparm -I' you need to see this line: * Deterministic read ZEROs after TRIM [See the ATA IDENTIFY DEVICE command] SCSI: In the READ CAPACITY (16) response the LBPRZ needs to be set to 1. Recently the same LBPRZ bit was added to the Logical Block Provisioning VPD page (sbc3r27.pdf). Doug Gilbert -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
