{"id":74,"date":"2009-04-01T03:06:42","date_gmt":"2009-04-01T03:06:42","guid":{"rendered":"http:\/\/www.backupassist.com\/blog\/support\/backing-up-using-esata-disk\/"},"modified":"2019-11-13T09:20:55","modified_gmt":"2019-11-13T09:20:55","slug":"backing-up-using-esata-disk","status":"publish","type":"post","link":"https:\/\/www.backupassist.com\/blog\/backing-up-using-esata-disk","title":{"rendered":"Backing up using eSata disk"},"content":{"rendered":"

Hi all,<\/p>\n

There was a recent question on our form on using eSata disk for backup, specifically concerning AHCI, eject, differences between AHCI and USB.<\/p>\n

Because it’s quite a hot topic, I’ll repost the question and our reply here, so subscribers to this blog can stay up to date \ud83d\ude42<\/p>\n

My big issue is with eSATA and AHCI. Under Linux, if you get the AHCI driver installed properly, eSATA drives act like your typical USB plug ‘n play device. “mount” and ‘umount” work exactly the same way. But if you do not have the AHCI drive properly installed (you are still using the ATA_PIIX driver), the mounting of a removed eSATA drive, or even seeking a removed eSATA drive’s status, will cause your computer to come down around your ears.<\/p>\n

Now under Windows, you have to unmount an eSATA drive by uninstalling it in the device manager. The little green eject device arrow is not eSATA\/AHCI aware. I have no idea what will happen under Windows if you do not have the proper ICH* driver loaded.<\/p>\n

AHCI is not USB.<\/p>\n

My concerns:
\n1) are you AHCI aware?
\n2) Do you specifically address the differences between AHCI and USB?
\n3) What happens if you seek a removed eSATA drive’s status?<\/p><\/blockquote>\n

Our answer to this:<\/p>\n

I have to say that our own testing confirms exactly your observations about AHCI and eSATA. We\u2019ve done specific testing on a variety of machines and motherboards, and found that when AHCI works, it works, but it seems to be the exception rather than the rule.<\/p>\n

BackupAssist is actually able to function with eSATA regardless of whether you have AHCI enabled or not. It\u2019s designed to simply avoid many of the problems that you would experience, because it will:<\/p>\n

    \n
  1. Before the backup, do a full hardware rescan, so that:\n
      \n
    1. If AHCI is enabled and a drive has been newly physically connected, the rescan has no effect because the drive is already present<\/li>\n
    2. If AHCI is enabled and a drive has been soft-ejected (safely removed) then the rescan will inject it back into the system<\/li>\n
    3. If AHCI is not enabled, any newly connected drives will be injected back into the system<\/li>\n<\/ol>\n<\/li>\n
    4. After the backup, it will do a safely remove hardware:<\/li>\n
    5. \n
        \nRegardless of AHCI, the drive letter will disappear, and the device can be unplugged safely<\/ol>\n<\/li>\n<\/ol>\n

        Note that this method covers all cases that we know of, and appears to work flawlessly on all the hardware in our test lab (Server 2003 and 2008).<\/p>\n

        So to answer your questions<\/p>\n

        1. Yes, we\u2019re AHCI aware, but it actually makes no difference for the reasons outlined above
        \n2. Yes, we handle AHCI and USB, and we don\u2019t even need AHCI to be activated in order for it to work. In the UI, if you click the \u201cDetect\u201d tab, it will do the hardware rescan to detect newly inserted drives.
        \n3. This will never happen with BackupAssist because we eject the device after the backup.<\/p>\n

        Following from your Q3, if you DON\u2019T use BackupAssist, and you unplug the device and AHCI isn\u2019t installed, Windows sees a \u201cghost\u201d copy of the drive and tries to cache changes, eventually getting into a big mess and rebooting or blue screening.<\/p>\n

        So the rule is: use BackupAssist\u2019s features and there shouldn’t be any problems!<\/p>\n","protected":false},"excerpt":{"rendered":"

        Hi all, There was a recent question on our form on using eSata disk for backup, specifically concerning AHCI, eject, differences between AHCI and USB. Because it’s quite a hot topic, I’ll repost the question and our reply here, so subscribers to this blog can stay up to date \ud83d\ude42 My big issue is with … Read more Backing up using eSata disk<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":13831,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,760],"tags":[],"class_list":["post-74","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-support","category-legacy"],"yoast_head":"\nBacking up using eSata disk - Cyber Resilience Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.backupassist.com\/blog\/backing-up-using-esata-disk\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Backing up using eSata disk - Cyber Resilience Blog\" \/>\n<meta property=\"og:description\" content=\"Hi all, There was a recent question on our form on using eSata disk for backup, specifically concerning AHCI, eject, differences between AHCI and USB. Because it’s quite a hot topic, I’ll repost the question and our reply here, so subscribers to this blog can stay up to date \ud83d\ude42 My big issue is with ... 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He founded BackupAssist in 2002 \u2014 making him one of the longest-standing voices in Windows backup and data protection \u2014 and has spent the decades since talking to IT administrators around the world about what actually goes wrong, and why. His interest in data loss isn't abstract. Early in his career, he was working at the Monash University help desk when a student came in with a floppy disk that wouldn't read. They tried everything. None of their drives could read it either. The disk held her entire PhD dissertation \u2014 years of work \u2014 and it was the only copy. She broke down in tears. There was nothing he could do. Five years later, he wrote the first version of BackupAssist. Linus holds a Bachelor of Science in Computer Science and has held Microsoft Certified Solution Developer and Sun Certified Java Programmer credentials. More recently, he has completed digital forensics and cyber-security courses through the Black Hat Conference. He has spoken on information security and cryptography at Infosecurity Europe, addressed politicians and policymakers at Australian Parliament House, presented to SMB IT administrators at the IT Pro Experts Conference, and served as a guest lecturer to Cyber Security master's students at the University of Melbourne. On this blog, Linus writes about backup strategy and the technical side of cyber-resilience \u2014 drawing on 24 years of product development and direct conversation with the IT professionals BackupAssist is built for. 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He has spoken on information security and cryptography at Infosecurity Europe, addressed politicians and policymakers at Australian Parliament House, presented to SMB IT administrators at the IT Pro Experts Conference, and served as a guest lecturer to Cyber Security master's students at the University of Melbourne. On this blog, Linus writes about backup strategy and the technical side of cyber-resilience \u2014 drawing on 24 years of product development and direct conversation with the IT professionals BackupAssist is built for. 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