@ liuzhaoyzz
Well, as now our fellow a1ive confirmed:
xz and gz. lz4 is not supported.
I want to comment something else to you, I saw in a post from you http://wuyou.net/for...75&pid=4192808 that you talk about NTFS compression and Compact mode compression.
And I want to share some info with you:
Comments about Compact mode installations and NTFS compresed installations.
NTFS compression is the lowest, and also very slow, - it uses a single core thread on CPU when compressing on a Win OS - almost every single file ends highly frgmented, a full defragmentation is highly recommended.
Compact mode compression - 8K is the new standard on recent 10 OS versions (it used to be 4K), it has always used all CPU cores threads, so it is faster and you get even on 4K a higher compression , in all cases (4K, 8K, 16K or LZX) all files end unfragmented, but the used espace could be not 100% contiguous, defragmentation is not required, (but I usually prefer to defragment the VHD content).
Why my interest on gzip and lz4 compression:
About the gzip or lz4 compression, lz4 is faster to compress and decompress than gzip, (recommended parameters -12 --content-size --favor-decSpeed), I ran several tests and found a lz4 compressed VHD loads to Ram faster.
From: http://reboot.pro/to...-faster-on-ram/
All test ran on same I3 3225, 3.3 GHZ, 8 GB Ram at 1333 MHZ, Rambooting from SSD Adata SU650 into Adata XPG enclosure 3.0 USB.
This are my findings:
Speed:
VHD Time to load on RAM
1 - 10x64-WB.vhd Ramboot using g4d grub4dos-0.4.6a-2018-12-23 12 seconds
2 - 10x64-WB.vhd.gz Ramboot using g4d grub4dos-0.4.6a-2018-12-23 7 seconds
3 - 10x64-WB-EXP.vhd Ramboot using g4d 0.4.5c Modd by kyrionix 4 seconds
4 - 10x64-WB.vhd.lz4 Ramboot using g4d grub4dos-0.4.6a-2019-03-25 3.67 seconds
LZ4_Compressor >>> (GUI for lz4) It can compress and decompress to/from lz4 any file not only VHDs.
And also lz4 helps to improve a lot the loading to Ram time when only are available USB 2.0 ports, additionally it saves a lot of espace on USB devices.
From same link:
Saved espace: VHD Used Saved espace 10x64-WB.vhd 1536 MB 0 % saved espace 10x64-WB.vhd Expandable 480 MB 68.75 % saved espace 10x64-WB.vhd.gz 233 MB 84.83 % saved espace 10x64-WB.vhd.lz4 135 MB 91.21 % saved espace
Then my RamOS on VHD is usually installed on Compact LZX mode or on Wimboot mode (for low Ram PCs), And both lz4 compressed to save space and loading time.
Hope previous info could be useful for you my friend.
alacran
UEFI RAMOS 7x64 UsedSize=1.93 GB in VHD
