BOOT PROBLEM WITH AN EXTERNAL SSD USB DISK (WITH A LINUX SYSTEM, GPT/BIOS SETUP AND GRUB2)
I prepared the following text to address different recipients I intend to submit it to: Manjaro Linux, Adata ssd, Asus, Grub2 and Super Grub2 Disk. I hope it is adquate for a first aproach of the problem. For additional technical data about my system see http://pastebin.com/nfDms8Mc (search for inxi, lspci, lsusb, dmidecode). I have a Asus-N55SL-S1094V notebook with Windows7 on the internal HDD and Manjaro Linux on a Adata External SSD SE720 USB3 with a GPT/Bios setup as per 'Installation to SSD (quick guide) - Manjaro Linux' and Grub2. 1 - My boot problem: - power on - Adata shows on boot menu - if Adata selected I get a line with GRUB followed by garbage - if I enter key 'e' (edit), 'c' (command mode), or any other key, Windows7 boots. - I have no problem booting from other USB external media drives or pens (not ssd and with normal MBR/Bios setup) 2 - Workaround to boot (time consuming, defeats the purpose of a quick boot frm a ssd, my motivation to buy one): - power on - select 'Enter setup' (bios) instead of Adata - on 'boot order' choose Adata to boot before internal HDD - Save and Exit - on boot menu select Adata - now success: Grub 2 menu shows 3 - I noticed when I enter bios: - 'HDD bbs priorities' shows WD..(internal HDD), then other external USB media, but no Adata SSD. - 'Floppy drive bbs priorities' shows Adata SSD. - other settings as normal: AHCI interface, EFI disabled - bios up to date. 4 - There is no problem when I restart from within the system (Manjaro Linux) instead of power off and then power on. With above workaround (2) I can boot from one USB3 and 2 USB2 ports but not from the other USB3 port which allows charge of usb media even when the notebook is shutdown. 5 - Power on and booting with 'Super Grub2 Disk' detects Adata SSD as a floppy with partions 'fd0,gpt1',...,'fd0,gpt4' and no boot. If (workaround): - power on - Enter setup (bios) - set 'boot order' to Adata before HDD - Save and Exit - on boot menu choose CD drive (Super Grub2 Disk) - this time 'Super Grub2 Disk' detects correctly Adata SSD as 'hd2,gpt1', ...,'hd2,gpt4' 6 - I used another notebook, an Asus A6Tc (older), with same problem: if in boot menu I select Adata I get I line with 'GRUB:' only and no way to boot; I have to enter bios setup and afterwords select Adata. Thank you for any help Joao Franco
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